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

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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

Images

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, Syn. B. campestris = B. rapa); Herbarium Pacificum Staff 1998:9 (remove Mo [re-IDed Sinapis arvensis]); Oppenheimer & Bartlett 2002:4 (WM); Staples & Herbst 2005:202 (DESCR); Starr & Martz 1999/Conant 147 BISH (PH†, 1983); Munro 524 BISH (L†, 1930)

Occurrences

SNo. Scientific Name Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Brassica rapa 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
2 Brassica rapa Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2409 Kauai BISH 1909-00-00
3 Brassica rapa unknown PreservedSpecimen Forbes, C.N. Collector Number: 197.H BISH Specimen 6/19/1911
4 Brassica rapa Honolulu cultivated PRESERVED_SPECIMEN Chung, H.L. 1314 Oahu BISH 2/11/1926
5 Brassica rapa 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
6 Brassica rapa 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
7 Brassica rapa 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
8 Brassica rapa honolulu area In patches of Andropogon pertusus on hardpan substrate. PRESERVED_SPECIMEN chung, h.l. collector number: 1313 Kahoolawe BISH 2/11/1926
9 Brassica rapa kulani project, s. hilo district PRESERVED_SPECIMEN davis, j. collector number: 447 Hawaii BISH 2/12/1981
10 Brassica rapa honolulu, chinatown; purchased in maunakea marketplace PRESERVED_SPECIMEN staples, g.w. herbst, d.r. collector number: s.n. Oahu BISH 12/10/1994
11 Brassica rapa northwestern hawaiian islands open wood PRESERVED_SPECIMEN herbst, d.r. collector number: 6479 Hawaii BISH 12/7/1980
12 Brassica rapa 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
13 Brassica rapa Halemanu, Kauia PRESERVED_SPECIMEN 2394 Kauai BISH 2/14/1909
14 Brassica rapa 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
15 Brassica rapa Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2407 Kauai BISH 2/14/1909
16 Brassica rapa Honolulu, Chinatown; purchased in Maunakea marketplace PRESERVED_SPECIMEN Staples, G. s.n. Oahu BISH 12/10/1994
17 Brassica rapa honolulu cultivated PRESERVED_SPECIMEN chung, h.l. collector number: 1314 Oahu BISH 2/11/1926
18 Brassica rapa unknown PRESERVED_SPECIMEN forbes, c.n. collector number: 198.h BISH 6/19/1911
19 Brassica rapa Waialae roadside PRESERVED_SPECIMEN Forbes, C.N. 2424.O Oahu BISH 2/16/1917
20 Brassica rapa Honolulu cultivated PRESERVED_SPECIMEN Chung, H.L. Collector Number: 1314 Oahu BISH 2/11/1926
21 Brassica rapa halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2407 Kauai BISH 2/14/1909
22 Brassica rapa 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
23 Brassica rapa koele PRESERVED_SPECIMEN forbes, c.n. collector number: 20.2 Lanai BISH 6/1/1913
24 Brassica rapa Hawaii National Park, Kilauea, Old Volcano House, frequent in grasy areas PRESERVED_SPECIMEN Fagerlund, G.O. 467 Hawaii BISH 3/15/1943
25 Brassica rapa waialae roadside PRESERVED_SPECIMEN forbes, c.n. collector number: 2424 o Oahu BISH 2/16/1917
26 Brassica rapa 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
27 Brassica rapa Kauai PRESERVED_SPECIMEN Hume, L. 481 Kauai BISH 2/28/1990
28 Brassica rapa Kanepuu PRESERVED_SPECIMEN Munro, G.C. 524 Lanai BISH 2/3/1930
29 Brassica rapa honolulu PRESERVED_SPECIMEN a. s. hitchcock 13673 Oahu US 6/15/1916
30 Brassica rapa 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
31 Brassica rapa Honolulu, Chinatown; purchased in Maunakea Marketplace. PRESERVED_SPECIMEN George Staples s.n. Oahu PTBG 12/10/1994
32 Brassica rapa Kalaheo, Puuwai Road. PRESERVED_SPECIMEN Tim Flynn 2891 Kauai PTBG 4/5/1988
33 Brassica rapa 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
34 Brassica rapa Humuula Sheep Station, Puu Huluhulu PRESERVED_SPECIMEN Hitchcock, A. S. 14449 Hawaii US 8/27/2016
35 Brassica rapa Hwy 51 one-half mile North of junction with Hwy 570. Weed along roadside. PRESERVED_SPECIMEN Tim Flynn 3729 Kauai PTBG 1/3/1990
36 Brassica rapa 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
37 Brassica rapa 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
38 Brassica rapa 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
39 Brassica rapa Honolulu PRESERVED_SPECIMEN Hitchcock, A. S. 13673 Oahu US 6/15/2016
40 Brassica rapa humuula sheep station, puu huluhulu PRESERVED_SPECIMEN a. s. hitchcock 14449 Molokai US 8/27/1916
41 Brassica rapa 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
42 Brassica rapa 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
43 Brassica rapa Kaala, by cable station PRESERVED_SPECIMEN St. John, H. 22272 Oahu BISH 11/17/1946
44 Brassica rapa kanepuu PRESERVED_SPECIMEN munro, g.c. collector number: 524 Maui BISH 2/3/1930
45 Brassica rapa 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
46 Brassica rapa 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
47 Brassica rapa kaala, by cable station PRESERVED_SPECIMEN st.john, h. collector number: 22272 Oahu BISH 11/17/1946
48 Brassica rapa halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2408 Kauai BISH 2/14/1909
49 Brassica rapa Kamoku PRESERVED_SPECIMEN Munro, G.C. 267 Lanai BISH 12/20/1913
50 Brassica rapa 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
51 Brassica rapa halemanu, kauia PRESERVED_SPECIMEN collector number: 2394 Kauai BISH 2/14/1909
52 Brassica rapa honolulu, 42 coelho way PRESERVED_SPECIMEN neal, m.c. collector number: s.n. Oahu BISH 11/14/1942
53 Brassica rapa 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
54 Brassica rapa Honolulu area grown at U.S. exp. sta PRESERVED_SPECIMEN Chung, H.L. 1313 Oahu BISH 2/11/1926
55 Brassica rapa East Maui, Halimaile Rd growing along the roadside as a weed. PRESERVED_SPECIMEN Hobdy, R.W. 3289 Maui BISH 4/13/1991
56 Brassica rapa kauai PRESERVED_SPECIMEN hume, l. collector number: 481 Kauai BISH 2/28/1990
57 Brassica rapa Honolulu, 42 Coelho Way PRESERVED_SPECIMEN Neal, M.C. s.n. Oahu BISH 6/14/1942
58 Brassica rapa 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
59 Brassica rapa unknown PRESERVED_SPECIMEN Forbes, C.N. 197.H BISH 6/19/1911
60 Brassica rapa 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
61 Brassica rapa kamoku PRESERVED_SPECIMEN munro, g.c. collector number: 267 Lanai BISH 12/20/1913
62 Brassica rapa Cultivated; Kalaheo, Puu wai road. Grown for edible leaves PRESERVED_SPECIMEN Flynn, T. 2891 Oahu BISH 4/5/1988
63 Brassica rapa 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
64 Brassica rapa 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
65 Brassica rapa 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
66 Brassica rapa Halemanu, Kauia PRESERVED_SPECIMEN Rock, J.F.C. 2408 Kauai BISH 1909-00-00
67 Brassica rapa Moanalua Valley on O'ahu PRESERVED_SPECIMEN Forbes, C.N. s.n. Oahu BISH 3/18/1909
68 Brassica rapa 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
69 Brassica rapa moanalua valley on o'ahu PRESERVED_SPECIMEN forbes, c.n. Oahu BISH 3/18/1909
70 Brassica rapa Koele PRESERVED_SPECIMEN Forbes, C.N. 20.L Lanai BISH 6/1/1913
71 Brassica rapa halemanu, kauia PRESERVED_SPECIMEN rock, j.f.c. collector number: 2409 Oahu BISH 2/14/1909
72 Brassica rapa cultivated; kalaheo, puu wai road. grown for edible leaves PRESERVED_SPECIMEN flynn, t. collector number: 2891 Oahu BISH 4/5/1988
73 Brassica rapa east maui, halimaile rd growing along the roadside as a weed. PRESERVED_SPECIMEN hobdy, r.w. collector number: 3289 Maui BISH 4/13/1991