Difference between revisions of "Draba pterosperma"

Payson

Amer. J. Bot. 4: 266. 1917.

Endemic
Treatment appears in FNA Volume 7. Treatment on page 332. Mentioned on page 270, 286.
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|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V7/V7_454.xml
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|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V7/V7_454.xml
 
|tribe=Brassicaceae tribe Arabideae
 
|tribe=Brassicaceae tribe Arabideae
 
|genus=Draba
 
|genus=Draba

Revision as of 23:57, 27 May 2020

Perennials; (densely cespitose to pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3–1.1 dm, pubescent throughout, trichomes sub-dendritic, 2–7-rayed, (often crisped), 0.2–0.7 mm. Basal leaves (densely imbricate); rosulate; petiolate; petiole base and margin ciliate, (trichomes simple or branched, often crisped, 0.3–1 mm); blade oblanceolate to obovate or spatulate, 0.2–0.7 cm × 1–2.8 mm, margins entire, surfaces densely pubescent (often grayish) with stellate-dendritic, stalked, 5–12-rayed, (often crisped) trichomes, 0.2–0.6 mm. Cauline leaves 0. Racemes 4–12-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels erect (and subappressed to rachis) or ascending, straight, (3–)4–9(–12) mm, pubescent as stem. Flowers: sepals oblong, 3–4 mm, pubescent, (trichomes stalked, branched, crisped); petals yellow, oblanceolate, 6–7 × 1.5–2.5 mm; anthers oblong, 0.7–0.9 mm. Fruits broadly ovate to lanceolate or subelliptic, plane, flattened, 5–10(–13) × (2.5–)3.5–5(–6) mm; valves pubescent, trichomes short stalked, 2–7-rayed, (straight or crisped), 0.15–0.6 mm; ovules 8–12 per ovary; style 1.5–3(–3.8) mm. Seeds (winged), ovate, 1.6–3 × 1.3–1.8 mm; (wing 0.3–0.9 mm wide).


Phenology: Flowering Jun–Sep.
Habitat: Limestone and marble outcrops, talus, gravel slopes
Elevation: 1500-2500 m

Discussion

Draba pterosperma is a distinctive species that is restricted to the Marble Mountains of northern California (Siskiyou County).

Selected References

None.

Lower Taxa

None.