Draba howellii

S. Watson

Proc. Amer. Acad. Arts 20: 354. 1885.

Endemic
Treatment appears in FNA Volume 7. Treatment on page 312. Mentioned on page 273, 279, 280, 284, 300.

Perennials; (loosely cespitose); caudex branched (somewhat surculose, with persistent leaf remains, branches sometimes terminating in sterile rosettes); often scapose. Stems unbranched, (0.2–) 0.4–1.1 (–1.5) dm, usually pubescent throughout, rarely glabrous, trichomes simple and 2–4-rayed, 0.1–0.6 mm. Basal leaves rosulate; blade (somewhat fleshy), oblanceolate or spatulate to obovate, 0.4–1.6 (–2.5) cm × (1.5–) 3–6 (–10) mm, margins entire, surfaces pubescent with stalked, cruciform, and fewer 2-rayed or 3-rayed trichomes, 0.07–0.5 mm, rarely both surfaces glabrous and trichomes on margins, (midvein obscure abaxially). Cauline leaves 0–3 (or 4); sessile; blade ovate to oblong, margins entire, pubescent as basal. Racemes (5–) 7–18 (–25) -flowered, usually ebracteate, sometimes proximalmost 1 or 2 flowers bracteate, elongated in fruit; rachis not flexuous, usually pubescent as stem, rarely glabrous. Fruiting pedicels divaricate-ascending, straight, (4–) 7–10 mm, usually pubescent as stem, rarely glabrous. Flowers: sepals ovate, 2.5–3.2 mm, glabrous or pubescent, (trichomes 2–4-rayed); petals yellow, oblanceolate, 5.5–8 × 1–2 mm; anthers oblong, 0.7–0.9 mm. Fruits lanceolate to elliptic-lanceolate or broadly ovate, plane (not curved), strongly flattened, 6–11 (–15) × 3–5 mm; valves usually pubescent, rarely glabrous, trichomes simple and 2–4-rayed, 0.05–0.3 mm; ovules 8–22 per ovary; style (0.7–) 1.6–3 mm. Seeds oblong, 1–1.6 × 0.8–1 mm, (sometimes distally appendaged).


Phenology: Flowering Jul–Aug.
Habitat: Rocky summits, cracks in granite walls, rock crevices
Elevation: 1900-2700 m

Discussion

Draba howellii is known from Siskiyou and Trinity counties, California, and Josephine County, Oregon. One collection, Tracy 14623 (DS, GH, UC), is unusual in having glabrous stems, pedicels, and leaf blade surfaces. In this regard, it resembles D. carnosula, but in all other respects (bracts, seeds, inflorescences, etc.), it is indistinguishable from D. howellii. For characteristics distinguishing the two species, see 23. D. carnosula.

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number.

... more about "Draba howellii"
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
S. Watson +
sessile +  and petiolate +
appendaged +  and unappendaged +
1.6 cm16 mm <br />0.016 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not +  and auriculate +
0.4 cm4 mm <br />0.004 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
lobed +, toothed +  and entire +
ovate;oblong +
much smaller +  and reduced +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
urceolate +, campanulate +  and tubular +
scapose +  and branched +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
Calif. +  and Oreg. +
1900-2700 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
actinomorphic +
orange;purple;orange;purple;pink;white;yellow +
spreading +, ascending +  and erect +
linear +, oblanceolate +, spatulate +, obovate +, subsaccate +, not saccate +, oblong +  and ovate +
latiseptate +, twisted +  and sessile +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
indehiscent +  and dehiscent +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
flattened +, plane +, lanceolate +  and elliptic-lanceolate or broadly ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Rocky summits, cracks in granite walls, rock crevices +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
5.5mm;8mm +
rudimentary +
oblanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Jul–Aug. +
trinucleate +  and 3(-11)-colpate +
Proc. Amer. Acad. Arts +
bracteate;ebracteate;(5-)7-18(-25)-flowered +
ascending +  and erect +
proximalmost +
slender +
not flexuous +
glabrous +  and pubescent +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.1 cm1 mm <br />0.001 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
pubescent +  and glabrous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
reduced +
latiseptate +, twisted +  and sessile +
indehiscent +  and dehiscent +
terete +, plane +, subglobose +, ovoid +, suborbicular +, linear +, oblong +, elliptic +, lanceolate +  and ovate +
latiseptate +, twisted +  and sessile +
indehiscent +  and dehiscent +
terete +, plane +, subglobose +, ovoid +, suborbicular +, linear +, oblong +, elliptic +, lanceolate +  and ovate +
tetradynamous +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
straight +
procumbent +  and decumbent +
prostrate +  and decumbent +
divaricate-ascending +
glabrous +  and pubescent +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
subsessile +, sessile +  and petiolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
persistent +
distinct +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glabrous +  and pubescent +
0.007 cm0.07 mm <br />7.0e-5 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Abdra +, Erophila +, Nesodraba +  and Tomostima +
Draba howellii +
species +
simple +  and stalked +
cruciform +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
glabrous +  and pubescent +
anastomosing +
scapose +  and not +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +