Brassica rapa

L. (1753)

This name is accepted

Kingdom: Viridiplantae Phylum: Magnoliophyta Class/Clade: Eudicot-Rosids Order: Brassicales Family: Brassicaceae Genus: Brassica

bok choi, Chinese cabbage, Chinese flowering cabbage, choy sum, field mustard, pak choi, pak choy, pok choi, tatsoi, turnip, turnip

Description

Key Characters:

Growth Form: Annual or biennial herbs 3–10 dm tall, glabrous and glaucous, sometimes sparsely pubescent below.with watery and usually pungent sap.

Stems:

Roots:

Leaves: Leaves simple. Alternate or rarely opposite. Basal leaves lyrate–pinnatifid, 10–30 cm long, 2–10 cm wide, upper leaves oblong–lanceolate, usually 3–10 cm long. Base sessile and auriculate-clasping. Margins entire to shallowly dentate. Petioles absent. Stipules absent.

Flowers: Flowers in usually bractless, in elongate, terminal racemes. Flowers bisexual (perfect), actinomorphic or rarely slightly irregular; showy. Calyx of 4 sepals, ascending or spreading, deciduous, erect, usually oblong, inner ones ± gibbous at base. Corolla of 4 petals, rarely absent, yellow, 6–10 mm long, long–clawed. Stamens (2–4)6(–16), tetradynamous, the inner 4 usually in pairs, sometimes connate at base in pairs; anthers dithecal, opening by longitudinal slits. Ovary superior, 2(4?)-carpellate, usually 2-celled by means of a false, but usually complete septum, rarely 1-celled, sessile or rarely stipitate; ovules 1 to numerous, borne on parietal placentas on replum margin at periphery of ovary wall, campylotropous or occasionally anatropous; style 1 or occasionally absent; stigma truncate or 2-lobed.

Fruit: Capsules divided into 2 cells by the usually thin and membranous septum; elongate (at least 3 times as long as wide) and referred to as a silique. fruit an elongate; linear silique; often torulose; terete (cylindrical) or 4–angled; with a stout; indehiscent; flat or conical; often 1–seeded beak. Siliques terete (cylindrical); 4–7 cm long; the beak 10–20 mm long. Seeds 1 to numerous; often becoming mucilaginous when wet; endosperm essentially absent. Seeds reddish gray; globose or slightly compressed; 1.5–2 mm in diameter; the surface reticulate.

Ploidy: 2n = 18; 20; 22

Habitat: Naturalized in disturbed habitats; especially pastures.

Elevation Range:

Historical Distribution

Synonyms (250)

Uses and Culture

USES

  • Yes

Natural History

Statewide Status

Naturalized

Island Status

Kaua'i Naturalized
Manawai (Pearl & Hermes Atoll) Naturalized
O'ahu Naturalized
Lana'i Naturalized
Maui Naturalized
Hawai'i Naturalized

Dispersal Agents


Pollinators

Bibliography

Name Published In: Sp. Pl.: 666 (1753)

Other References

Wagner et al. 1990:400 (PH, K, O, Mo, L, H [as B. campestris]); Al-Shehbaz 1985:290/Wagner & Herbst 1995:17 (EM, NOM:Syn. B. campestris = B. rapa); Herbarium Pacificum Staff 1998:9 (remove Mo, spms. renamed Sinapis arvensis); Oppenheimer & Bartlett 2002:4 (WM); Staples & Herbst 2005:200 (KEY), 202 (DESCR)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Brassica rapa L. Kamoku PRESERVED_SPECIMEN Munro, G.C. 267 Lanai BISH 12/20/1913
2 Brassica rapa L. Kulani Project, South Hilo District On edge of disturbed forest: Metrosideros with Myoporum, Cibotium and Styphelia. Only 150' from road. PRESERVED_SPECIMEN Davis, J. Collector Number: 447 Hawaii BISH 2/12/1981
3 Brassica rapa L. halemanu, kauia PRESERVED_SPECIMEN collector number: 2394 Kauai BISH 2/14/1909
4 Brassica rapa L. Kulani Project, S. Hilo District Localized weed on edge of disturbed forest: Metrosideros with Myoporum, Cibotium and Styphelia. Only 150' from road. PRESERVED_SPECIMEN Davis, J. 447 Hawaii BISH 2/12/1981
5 Brassica rapa L. honolulu, 42 coelho way PRESERVED_SPECIMEN neal, m.c. collector number: s.n. Oahu BISH 11/14/1942
6 Brassica rapa L. East Maui, Halimaile Rd growing along the roadside as a weed. PRESERVED_SPECIMEN Hobdy, R.W. 3289 Maui BISH 4/13/1991
7 Brassica rapa L. Honolulu area grown at U.S. exp. sta PRESERVED_SPECIMEN Chung, H.L. 1313 Oahu BISH 2/11/1926
8 Brassica rapa L. purchased at daiei (formely holiday mart), kailua for $1.99 per bag. originally grown on big island PRESERVED_SPECIMEN staples, g.w. collector number: 936 Oahu BISH 11/7/1994
9 Brassica rapa L. kauai PRESERVED_SPECIMEN hume, l. collector number: 481 Kauai BISH 2/28/1990
10 Brassica rapa L. Honolulu, 42 Coelho Way PRESERVED_SPECIMEN Neal, M.C. s.n. Oahu BISH 6/14/1942
11 Brassica rapa L. West Maui, Wailuku Distr., Kahakuloa, north of Makamakaole Stream Common roadside weed in recently developed subdivision. PRESERVED_SPECIMEN Oppenheimer, H.L. Collector Number: H129905 Maui BISH 12/26/1999
12 Brassica rapa L. unknown PRESERVED_SPECIMEN Forbes, C.N. 197.H BISH 6/19/1911
13 Brassica rapa L. Kulani Project, S. Hilo District Localized weed on edge of disturbed forest: Metrosideros with Myoporum, Cibotium and Styphelia. Only 150' from road. PRESERVED_SPECIMEN Davis, J. Collector Number: 447 Hawaii BISH 2/12/1981
14 Brassica rapa L. lihue district; hwy 51 one-half mile north of junction with hwy 570. weed along roadside PRESERVED_SPECIMEN flynn, t. collector number: 3729 Kauai BISH 1/3/1990
15 Brassica rapa L. halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2409 Oahu BISH 2/14/1909
16 Brassica rapa L. kamoku PRESERVED_SPECIMEN munro, g.c. collector number: 267 Lanai BISH 12/20/1913
17 Brassica rapa L. moanalua valley on o'ahu PRESERVED_SPECIMEN forbes, c.n. Oahu BISH 3/18/1909
18 Brassica rapa L. Koele PRESERVED_SPECIMEN Forbes, C.N. 20.L Lanai BISH 6/1/1913
19 Brassica rapa L. Lihue District; Hwy 51 one-half mile north of junction with Hwy 570. Weed along roadside PRESERVED_SPECIMEN Flynn, T. 3729 Kauai BISH 1/3/1990
20 Brassica rapa L. Cultivated; Kalaheo, Puu wai road. Grown for edible leaves PRESERVED_SPECIMEN Flynn, T. 2891 Oahu BISH 4/5/1988
21 Brassica rapa L. cultivated plants grow in aiea. veg. garden at the home of m.lee, 98-580 puaalii place PRESERVED_SPECIMEN lee, m. (sub staples iii, g.w.) collector number: 580 Oahu BISH 3/23/1990
22 Brassica rapa L. Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2408 Kauai BISH 1909-00-00
23 Brassica rapa L. Northwestern Hawaiian Islands Large colony at west central area of the eastern part of the island. No living plants at this time of the year PRESERVED_SPECIMEN Herbst, D.R. 6479 Pearl And Hermes Atoll BISH 12/7/1980
24 Brassica rapa L. Purchased at Daiei (formely Holiday Mart), Kailua for $1.99 per bag. Originally grown on Big Island PRESERVED_SPECIMEN Staples, G. 936 Oahu BISH 11/7/1994
25 Brassica rapa L. Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2409 Kauai BISH 1909-00-00
26 Brassica rapa L. kulani project, s. hilo district PRESERVED_SPECIMEN davis, j. collector number: 447 Hawaii BISH 2/12/1981
27 Brassica rapa L. honolulu, chinatown; purchased in maunakea marketplace PRESERVED_SPECIMEN staples, g.w. herbst, d.r. collector number: s.n. Oahu BISH 12/10/1994
28 Brassica rapa L. honolulu area In patches of Andropogon pertusus on hardpan substrate. PRESERVED_SPECIMEN chung, h.l. collector number: 1313 Kahoolawe BISH 2/11/1926
29 Brassica rapa L. cultivated; kalaheo, puu wai road. grown for edible leaves PRESERVED_SPECIMEN flynn, t. collector number: 2891 Oahu BISH 4/5/1988
30 Brassica rapa L. Moanalua Valley on O'ahu PRESERVED_SPECIMEN Forbes, C.N. s.n. Oahu BISH 3/18/1909
31 Brassica rapa L. east maui, halimaile rd growing along the roadside as a weed. PRESERVED_SPECIMEN hobdy, r.w. collector number: 3289 Maui BISH 4/13/1991
32 Brassica rapa L. unknown PreservedSpecimen Forbes, C.N. Collector Number: 197.H BISH Specimen 6/19/1911
33 Brassica rapa L. Clutivated plants grown in Aiea. At home of M. Lee, 98-580 Puqaalii Place Cultivated plants; vegetable garden at the home of M. Lee. PRESERVED_SPECIMEN Lee, M. 580 Oahu BISH 3/23/1990
34 Brassica rapa L. northwestern hawaiian islands On the west side in sandy soil. Associated species: Lepidium bidentatum. PRESERVED_SPECIMEN conant, s. collector number: 147 Pearl And Hermes Reef BISH 4/21/1983
35 Brassica rapa L. Honolulu cultivated PRESERVED_SPECIMEN Chung, H.L. 1314 Oahu BISH 2/11/1926
36 Brassica rapa L. West Maui, Wailuku Distr., Kahakuloa, north of Makamakaole Stream Common roadside weed in recently developed subdivision. PRESERVED_SPECIMEN Oppenheimer, H.L. H129905 Maui BISH 12/26/1999
37 Brassica rapa L. west maui, wailuku distr., kahakuloa, north of makamakaole stream Common roadside weed in recently developed subdivision. PRESERVED_SPECIMEN oppenheimer, h.l. collector number: h129905 Maui BISH 12/26/1999
38 Brassica rapa L. Honolulu, Chinatown; purchased in Maunakea marketplace PRESERVED_SPECIMEN Staples, G. s.n. Oahu BISH 12/10/1994
39 Brassica rapa L. northwestern hawaiian islands open wood PRESERVED_SPECIMEN herbst, d.r. collector number: 6479 Hawaii BISH 12/7/1980
40 Brassica rapa L. Halemanu, Kauia PRESERVED_SPECIMEN 2394 Kauai BISH 2/14/1909
41 Brassica rapa L. kulani project, south hilo district On edge of disturbed forest: Metrosideros with Myoporum, Cibotium and Styphelia. Only 150' from road. PRESERVED_SPECIMEN davis, j. collector number: 447 Hawaii BISH 2/12/1981
42 Brassica rapa L. Honolulu cultivated PRESERVED_SPECIMEN Chung, H.L. Collector Number: 1314 Oahu BISH 2/11/1926
43 Brassica rapa L. Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2407 Kauai BISH 2/14/1909
44 Brassica rapa L. honolulu cultivated PRESERVED_SPECIMEN chung, h.l. collector number: 1314 Oahu BISH 2/11/1926
45 Brassica rapa L. unknown PRESERVED_SPECIMEN forbes, c.n. collector number: 198.h BISH 6/19/1911
46 Brassica rapa L. hawaii national park, kilauea, old volcano house, frequent in grasy areas PRESERVED_SPECIMEN fagerlund, g.o. mitchell, a.l. collector number: 467 Hawaii BISH 3/15/1943
47 Brassica rapa L. halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2407 Kauai BISH 2/14/1909
48 Brassica rapa L. koele PRESERVED_SPECIMEN forbes, c.n. collector number: 20.2 Lanai BISH 6/1/1913
49 Brassica rapa L. Waialae roadside PRESERVED_SPECIMEN Forbes, C.N. 2424.O Oahu BISH 2/16/1917
50 Brassica rapa L. Northwestern Hawaiian Islands On the west side in sandy soil. Associated species: Lepidium bidentatum. PRESERVED_SPECIMEN Conant, S. 147 Pearl And Hermes Atoll BISH 4/21/1983
51 Brassica rapa L. waialae roadside PRESERVED_SPECIMEN forbes, c.n. collector number: 2424 o Oahu BISH 2/16/1917
52 Brassica rapa L. Hawaii National Park, Kilauea, Old Volcano House, frequent in grasy areas PRESERVED_SPECIMEN Fagerlund, G.O. 467 Hawaii BISH 3/15/1943
53 Brassica rapa L. Kauai PRESERVED_SPECIMEN Hume, L. 481 Kauai BISH 2/28/1990
54 Brassica rapa L. Humuula Sheep Station, Puu Huluhulu PRESERVED_SPECIMEN Hitchcock, A. S. 14449 Hawaii US 8/27/2016
55 Brassica rapa L. Kanepuu PRESERVED_SPECIMEN Munro, G.C. 524 Lanai BISH 2/3/1930
56 Brassica rapa L. Honolulu, Chinatown; purchased in Maunakea Marketplace. PRESERVED_SPECIMEN George Staples s.n. Oahu PTBG 12/10/1994
57 Brassica rapa L. Kalaheo, Puuwai Road. PRESERVED_SPECIMEN Tim Flynn 2891 Kauai PTBG 4/5/1988
58 Brassica rapa L. Grown in Aiea. Vegetable garden at the home of M. Lee, 98-580 Puaalii Place. Cultivated. PRESERVED_SPECIMEN Marion Lee sub George Staples 579 Oahu PTBG 3/23/1990
59 Brassica rapa L. Kapule Hwy., Lihue, North section between airport and Hanamaulu Stream bridge, East side of road. PRESERVED_SPECIMEN Lynwood Hume 495 Kauai PTBG 3/16/1990
60 Brassica rapa L. honolulu PRESERVED_SPECIMEN a. s. hitchcock 13673 Oahu US 6/15/1916
61 Brassica rapa L. Hwy 51 one-half mile North of junction with Hwy 570. Weed along roadside. PRESERVED_SPECIMEN Tim Flynn 3729 Kauai PTBG 1/3/1990
62 Brassica rapa L. Lihue District, Highway 51 0.5 mile north of junction with Highway 570, along roadside. PRESERVED_SPECIMEN Flynn, T. W. 3729 Kauai US 1/3/1990
63 Brassica rapa L. humuula sheep station, puu huluhulu PRESERVED_SPECIMEN a. s. hitchcock 14449 Molokai US 8/27/1916
64 Brassica rapa L. Kapule Highway, Lihu'e, north section between airport and Hanama'ulu Stream bridge, east side of road PRESERVED_SPECIMEN Hume, L. 495 Kauai US 3/16/1990
65 Brassica rapa L. Honolulu PRESERVED_SPECIMEN Hitchcock, A. S. 13673 Oahu US 6/15/2016
66 Brassica rapa L. lihue district, highway 51 0.5 mile north of junction with highway 570, along roadside. PRESERVED_SPECIMEN t. w. flynn 3729 Kauai US 1/3/1990
67 Brassica rapa L. kapule highway, lihu'e, north section between airport and hanama'ulu stream bridge, east side of road PRESERVED_SPECIMEN l. hume 495 Hawaii US 3/16/1990
68 Brassica rapa L. Cultivated plants grow in Aiea. Veg. garden at the home of M.Lee, 98-580 Puaalii Place PRESERVED_SPECIMEN Lee, M. 580 Oahu BISH 3/23/1990
69 Brassica rapa L. Kaala, by cable station PRESERVED_SPECIMEN St. John, H. 22272 Oahu BISH 11/17/1946
70 Brassica rapa L. Kulani Project, South Hilo District On edge of disturbed forest: Metrosideros with Myoporum, Cibotium and Styphelia. Only 150' from road. PRESERVED_SPECIMEN Davis, J. 447 Hawaii BISH 2/12/1981
71 Brassica rapa L. kanepuu PRESERVED_SPECIMEN munro, g.c. collector number: 524 Maui BISH 2/3/1930
72 Brassica rapa L. kaala, by cable station PRESERVED_SPECIMEN st.john, h. collector number: 22272 Oahu BISH 11/17/1946
73 Brassica rapa L. halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2408 Kauai BISH 2/14/1909