Draba helleriana

Greene

Pittonia 4: 17. 1899.

Basionym: Draba stylosa 1897
Synonyms: Draba aurea var. tylosa A. Gray Draba helleriana var. leiocarpa O. E. Schulz Draba helleriana var. neomexicana (Greene) O. E. Schulz Draba helleriana var. patens (A. Heller) O. E. Schulz Draba helleriana var. pinetorum (Greene) O. E. Schulz Draba neomexicana (A. Gray) A. Heller Draba neomexicana var. robusta A. Heller Draba pallida Draba patens Draba pinetorum
Treatment appears in FNA Volume 7. Treatment on page 311. Mentioned on page 272, 278, 279, 330, 345.

Biennials or perennials; (short-lived); caudex simple or branched; not scapose. Stems branched, (0.1–)1.5–4.3(–5.1) dm, hirsute throughout, trichomes simple, 0.4–1.3(–1.8) mm, with short-stalked to subsessile, 3–5-rayed ones, 0.2–0.4 mm, (some slightly coarser, 2-rayed). Basal leaves rosulate; petiolate; petiole base ciliate or not; blade oblanceolate to obovate, 0.9–4.1(–5.2) cm × 2–7(–10) mm, margins entire or dentate, surfaces pubescent, abaxially with stalked, cruciform, and fewer 3–5-rayed trichomes, 0.1–0.6 mm, adaxially with cruciform and simple trichomes, 0.4–1.3 mm, and smaller 2-rayed ones. Cauline leaves (8–)12–31(–43); sessile; blade ovate to lanceolate or oblong, margins usually dentate, rarely subentire, surfaces pubescent as basal. Racemes 10–52(–83)-flowered, usually ebracteate, rarely proximalmost 1 or 2 flowers bracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels horizontal to divaricate-ascending, straight or slightly curved upward, 4–10(–13) mm, pubescent as rachis abaxially, glabrous adaxially. Flowers: sepals oblong, 2.5–4 mm, pubescent, (trichomes simple and stalked, 2-rayed); petals yellow, oblanceolate, 5–7 × 1.5–2.2 mm; anthers oblong, 0.5–0.8 mm. Fruits (not appressed to rachis), lanceolate to ovate or oblong-lanceolate, slightly to strongly twisted or plane, flattened, 5–15 × 2–3.5 mm; valves puberulent, trichomes simple and subsessile, 2(–4)-rayed, 0.03–0.25(–0.8) mm; ovules 14–28 per ovary; style (1–)1.5–3.5 mm. Seeds oblong, 1–1.3 × 0.6–0.8 mm. 2n = 18.


Phenology: Flowering Jun–Sep.
Habitat: Oak and pine-fir woodlands, aspen groves, rocky meadows
Elevation: 2100-3600 m

Distribution

V7 410-distribution-map.gif

Ariz., Colo., N.Mex., Mexico (Nuevo León).

Discussion

Draba helleriana is highly variable and was divided by C. L. Hitchcock (1941) into four varieties. For a discussion of those and the circumscription of the species, see I. A. Al-Shehbaz and M. D. Windham (2007).

Selected References

None.

Lower Taxa

None.
... more about "Draba helleriana"
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Greene +
Draba stylosa +
Ariz. +, Colo. +, N.Mex. +  and Mexico (Nuevo León). +
2100-3600 m +
Oak and pine-fir woodlands, aspen groves, rocky meadows +
Flowering Jun–Sep. +
Draba aurea var. tylosa +, Draba helleriana var. leiocarpa +, Draba helleriana var. neomexicana +, Draba helleriana var. patens +, Draba helleriana var. pinetorum +, Draba neomexicana +, Draba neomexicana var. robusta +, Draba pallida +, Draba patens +  and Draba pinetorum +
Draba helleriana +
species +