Flora of North America species comparison

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Sibaropsis hammittii

Hammitt's clay-cress
Stems

0.5–2 dm, unbranched or branched (several, ascending) near base.
Basal leaves

soon withered.
Cauline leaves

blade somewhat fleshy, narrowly linear, (1–)1.5–3(–4.5) cm × 0.5–1 mm.
Flowers

sepals 2.8–3.2 × 0.5–1 mm;

petals 8.5–10 × 2–2.5 mm, margins not crisped, claw attenuate to base, 5–6 mm, longer than blade;

filaments: abaxial and lateral pairs distinct, shorter, adaxial pair ± connate, 4.5–5 mm;

anthers ca. 0.8 mm.
Fruiting pedicels

2.5–4 mm.
Fruits

erect, (1.5–)2–2.5 cm × 0.7–0.9 mm;

style (1.5–)3–4.5 mm.
Seeds

reddish to dark olive-brown, 1–1.3 × 0.5–0.6 mm.
2n

= 28.

Sibaropsis hammittii
Phenology Flowering Mar–Apr.
Habitat Patches of open, relatively moist, heavy clay soil dominated by native grasses, geophytes, and annuals
Elevation 700-1100 m (2300-3600 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Sibaropsis hammittii is known from two areas, separated by about 120 km, in the Peninsular Ranges of southern California: the Santa Ana Mountains in Riverside County, and the Viejas and Poser mountains in San Diego County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 694.
Parent taxa Brassicaceae > tribe Thelypodieae > Sibaropsis
Name authority S. Boyd & T. S. Ross: Madroño 44: 30, figs. 2–4. (1997)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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