Draba carnosula

O. E. Schulz in H. G. A. Engler

in H. G. A. Engler, Pflanzenr. 89[IV,105]: 82. 1927.

IllustratedEndemicConservation concern
Synonyms: Draba howellii var. carnosula (O. E. Schulz) C. L. Hitchcock
Treatment appears in FNA Volume 7. Treatment on page 299. Mentioned on page 270, 279, 300, 312.
Revision as of 23:56, 27 May 2020 by imported>Volume Importer

Perennials; (loosely cespitose); caudex branched (somewhat surculose, with persistent leaf bases, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3–1.2 dm, glabrous throughout. Basal leaves rosulate; petiolate; petiole (persistent, midvein prominent), ciliate, (trichomes sparse, short-stalked, 2–4-rayed, sometimes with simple ones, 0.2–0.5 mm); blade (somewhat fleshy), oblanceolate or spatulate to obovate, 0.3–1.5 cm × 1.5–5 mm, margins entire, (pubescent as petiole), surfaces glabrous. Cauline leaves 0. Racemes 2–6-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels divaricate-ascending, straight, 3–8 mm, usually glabrous, rarely trichomes simple. Flowers: sepals ovate, 3–4 mm, glabrous; petals yellow, oblanceolate, 5–7 × 1.3–2 mm; anthers oblong, 0.7–0.9 mm. Fruits lanceolate to elliptic-lanceolate, plane, strongly flattened, 10–23 × 4–6 mm; valves (each with distinct midvein), glabrous; ovules 8–12 per ovary; style 2–3 mm. Seeds (broadly winged), orbicular, 3–4.5 in diam.; (wing 1–1.5 mm wide).


Phenology: Flowering Jun–Jul.
Habitat: Open rocky hillsides
Elevation: 2800-3100 m

Discussion

Of conservation concern.

Although Draba carnosula was reduced by Hitchcock to a variety of D. howellii, it differs significantly by having leafless flowering stems, 2–6-flowered racemes, and broadly winged seeds 3–4.5 mm in diam. Draba howellii almost always has 1–3-leaved stems, (5–)7–18(–25)-flowered racemes, and not winged, distally appendaged seeds 1–1.6 mm in diam. Draba carnosula is known only from a few collections from Mount Eddy in Trinity County and the north side of Mount Shasta in Siskiyou County.

Selected References

None.

Lower Taxa

None.