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Lepidium oblongum

Small (1903)

This name is accepted

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

peppergrass, pepperwort

Description

Key Characters:

Growth Form: Annual or biennial herbs, pubescent with simple hairs.

Stems: Stems prostrate to ascending, 1–2(–3) dm long, usually branched from near the base, sparsely short–hirsute (hairs slender) or glabrous.

Roots:

Leaves: Leaves simple. Alternate or rarely opposite. Basal leaves 1–5 cm long, 1–2 times pinnately dissected, the lobes 0.6–3 mm wide; cauline leaves few, pinnately lobed, the segments obtuse to subacute. Margins dissected and serrate. Petioles of basal leaves (0.5–)1–3 cm. Cauline leaves sessile, rarely shortly petiolate. Stipules absent.

Flowers: Flowers usually bractless in elongate racemes 2–10 cm long, only slightly narrowed toward apex. Flowers bisexual (perfect), actinomorphic or rarely slightly irregular; white, pale yellow, or greenish, usually 2–3 mm long, sometimes absent. Calyx of 4 sepals, deciduous, erect, usually oblong, sometimes the inner 2 with gibbous bases that hold the nectar; usually magenta, ca. 0.8 mm long, often persistent in fruit, margins white. Corolla of 4 petals, rarely absent, yellow, white, or lavender, entire to emarginate, rarely lobed or fimbriate, usually with an elongate claw; linear, less than 0.5 mm long, or absent. Stamens 2; 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; styles short or essentially absent; stigma capitate.

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; flattened at right angles to the septum; broadly elliptic to obovate or suborbicular; 2.5–3.5 mm long; the apical notch broad; prominent; the margins clearly exceeding the style. Seeds 1 to numerous; ca. 1.5 mm long; often becoming mucilaginous when wet; endosperm essentially absent.

Ploidy:

Habitat: Naturalized in dry; disturbed sites.

Elevation Range: 0–200 m.

Historical Distribution

Uses and Culture

USES

Natural History

Statewide Status

Naturalized

Island Status

Ni'ihau(Incl. Lehua) Naturalized
Kaua'i Naturalized
O'ahu Naturalized
Molokai Naturalized
Lana'i Naturalized
Kaho'olawe Naturalized
Maui Naturalized

Dispersal Agents


Pollinators

Bibliography

Name Published In: Fl. S.E. U.S.: 468 (1903)

Other References

Wagner et al. 1990:407 (Ni, O, Mo, L, Ka); Lorence et al. 1995:26 (K); Starr et al. 2006:33 (EM); Oppenheimer 2019:4 (WM)

Occurrences

SNo. Scientific Name Scientific Name Authorship Locality Habitat Basis of Record Recorded By Record Number Island Source Date
1 Lepidium oblongum Small Kahuku. Roadside. PRESERVED_SPECIMEN Kenneth M. Nagata 3665 Oahu PTBG 6/21/1987
2 Lepidium oblongum Small Kaulakoi District, Kawakiunui Bay, at back of beach PRESERVED_SPECIMEN Herbst, D. R.; Spence, G. 5721 Molokai US 3/9/1976
3 Lepidium oblongum Small kaulakoi district, kawakiunui bay, at back of beach PRESERVED_SPECIMEN d. r. herbst & g. spence 5721 Molokai US 3/9/1976
4 Lepidium oblongum Small East Maui, Puu o Kali A'a lava substrate, seasonal dry forest. Associated vegetation: Sida fallax, Erythrina sandwicensis. PRESERVED_SPECIMEN Starr, F. 040128-2 Maui BISH 1/28/2004
5 Lepidium oblongum Small hanalei. hanalei pier park n. of hanalei landing and s. of the hanalei river mouth PRESERVED_SPECIMEN flynn, t. collector number: 2989 Kauai BISH 5/27/1988
6 Lepidium oblongum Small Plateua at head of Anahaki Gulch, Palaau Dry, open pasture PRESERVED_SPECIMEN Fosberg, F.R. 13420 Molokai BISH 12/26/1936
7 Lepidium oblongum Small Plateau at head of Anahaki Gulch, Palaau Dry, open pasture PRESERVED_SPECIMEN Fosberg, F.R. 13420 Molokai BISH 12/26/1936
8 Lepidium oblongum Small koko head, maunalua district Dry, rocky slope PRESERVED_SPECIMEN baker, r.j. collector number: s.n. Oahu BISH 3/25/1933
9 Lepidium oblongum Small honolulu district, koko head To the east and south of Ihiihilauakea Crater, in open areas, in rainy season. PRESERVED_SPECIMEN bruegmann, m.m. collector number: 145 Oahu BISH 1/29/1984
10 Lepidium oblongum Small plateua at head of anahaki gulch, palaau Dicranpteris, Metrosideros, Cladium, Clermontia persicifolia, Pittosporum acuminatum, Gouldia terminalis PRESERVED_SPECIMEN fosberg, f.r. collector number: 13420 Oahu BISH 12/26/1936
11 Lepidium oblongum Small barbers point military installation Prosopis pallida, Leucaena and other introduced herbs. PRESERVED_SPECIMEN higashino, p.k. collector number: 8206 Oahu BISH 3/3/1979
12 Lepidium oblongum Small Kanalo Valley PRESERVED_SPECIMEN St. John, H. 23596 Niihau BISH 3/30/1949
13 Lepidium oblongum Small east maui, puu o kali A'a lava substrate, seasonal dry forest. Associated vegetation: Sida fallax, Erythrina sandwicensis. PRESERVED_SPECIMEN starr, f. starr, k. collector number: 040128-2 Maui BISH 1/28/2004
14 Lepidium oblongum Small kealia aupuni PRESERVED_SPECIMEN munro, g.c. collector number: 405 Lanai BISH 3/26/1929
15 Lepidium oblongum Small eastern central part of island, near lua makika PRESERVED_SPECIMEN cuddihy, l.w. clarke, g. collector number: 418 Oahu BISH 4/25/1980
16 Lepidium oblongum Small koolauloa district: kahuku, roadside Roadside. PRESERVED_SPECIMEN nagata, k.m. collector number: 3665 Oahu BISH 6/21/1987
17 Lepidium oblongum Small transect c4- along secondary road to area above light house PRESERVED_SPECIMEN char, w.p. collector number: 78.058 Kahoolawe BISH 11/25/1978
18 Lepidium oblongum Small Three miles before Moomomi Beach Along side of the road. PRESERVED_SPECIMEN Shinsato, H. s.n. Molokai BISH 12/1/1958
19 Lepidium oblongum Small Kaluakoi District, Kawakiunui Bay Growing in sand at back of beach PRESERVED_SPECIMEN Herbst, D.R. 5721 Molokai BISH 3/9/1976
20 Lepidium oblongum Small Koolauloa District: Kahuku, roadside Roadside. PRESERVED_SPECIMEN Nagata, K.M. 3665 Oahu BISH 6/21/1987
21 Lepidium oblongum Small Honolulu District, Koko Head To the east and south of Ihiihilauakea Crater, in open areas, in rainy season. PRESERVED_SPECIMEN Bruegmann, M.M. 145 Oahu BISH 1/29/1984
22 Lepidium oblongum Small koko head, at summit, on trail PRESERVED_SPECIMEN egler, f.e. st.john, h. collector number: 37-96 Oahu BISH 5/18/1937
23 Lepidium oblongum Small Koko Head, Maunalua District Dry, rocky slope PRESERVED_SPECIMEN Baker, R.J. s.n. Oahu BISH 3/25/1933
24 Lepidium oblongum Small Koko Head, at summit, on trail PRESERVED_SPECIMEN Egler, F.E. 37-96 Oahu BISH 5/18/1937
25 Lepidium oblongum Small Kanalo Valley PreservedSpecimen St. John, H. Collector Number: 23596 Niihau BISH Specimen 3/30/1949
26 Lepidium oblongum Small E central part of island, near Lua Makika PRESERVED_SPECIMEN Cuddihy, L.W. 418 Kahoolawe BISH 4/25/1980
27 Lepidium oblongum Small kaluakoi district, kawakiunui bay Growing in sand at back of beach PRESERVED_SPECIMEN herbst, d.r. spence, g. collector number: 5721 Molokai BISH 3/9/1976
28 Lepidium oblongum Small Barbers Point Military installation Prosopis pallida, Leucaena and other introduced herbs. PRESERVED_SPECIMEN Higashino, P.K. 8206 Oahu BISH 3/3/1979
29 Lepidium oblongum Small Hanalei. Hanalei Pier Park N. of Hanalei landing and S. of the Hanalei River mouth PRESERVED_SPECIMEN Flynn, T. 2989 Kauai BISH 5/27/1988
30 Lepidium oblongum Small East Maui, Puu o Kali A'a lava substrate, seasonal dry forest. Associated vegetation: Sida fallax, Erythrina sandwicensis. PRESERVED_SPECIMEN Starr, F. Starr, K. Collector Number: 040128-2 Maui BISH 1/28/2004
31 Lepidium oblongum Small Kaena PRESERVED_SPECIMEN Munro, G.C. 291 Lanai BISH 4/25/1914
32 Lepidium oblongum Small palaau In open grassy pasture. PRESERVED_SPECIMEN hosaka, e.y. collector number: 1859 Molokai BISH 4/20/1937
33 Lepidium oblongum Small Palaau In open grassy pasture. PRESERVED_SPECIMEN Hosaka, E.Y. 1859 Molokai BISH 4/20/1937
34 Lepidium oblongum Small Hanalei. Hanalei Pier Park N. of Hanalei Landing and S. of the Hanalei River mouth. PRESERVED_SPECIMEN Tim Flynn 2989 Kauai PTBG 5/27/1988
35 Lepidium oblongum Small plateau at head of anahaki gulch, palaau Dry, open pasture PRESERVED_SPECIMEN fosberg, f.r. collector number: 13420 Molokai BISH 12/26/1936
36 Lepidium oblongum Small kanalo valley PRESERVED_SPECIMEN st.john, h. collector number: 23596 Niihau BISH 3/30/1949
37 Lepidium oblongum Small three miles febore moomomi beach Along side of the road. PRESERVED_SPECIMEN shinsato, h. collector number: s.n. Molokai BISH 12/1/1958
38 Lepidium oblongum Small Transect C4- along secondary road to area above light house PRESERVED_SPECIMEN Char, W.P. 78.058 Kahoolawe BISH 11/25/1978
39 Lepidium oblongum Small kaena subtidal PRESERVED_SPECIMEN munro, g.c. collector number: 291 Maui BISH 4/25/1914
40 Lepidium oblongum Small West Maui, Lahaina District, Olowalu Valley, southeast slope below Ulaula. Growing in dry shrubland on rocky ridge top. Vegetation: Dodonaea, Bidens, Melanthera, Chamaesyce, Panicum, Waltheria, Eragrostis, Doryopteris, Heteropogon, Sida, Leucaena, Erigeron, Melinis, Sonchus, Conyza, Emilia, Opuntia. PRESERVED_SPECIMEN Oppenheimer, H.L. H20910 Maui BISH 2/4/2009
41 Lepidium oblongum Small Kealia Aupuni PRESERVED_SPECIMEN Munro, G.C. 405 Lanai BISH 3/26/1929
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