Draba reptans

(Lamarck) Fernald

Rhodora 36: 368. 1934.

Basionym: Arabis reptans Lamarck in J. Lamarck et al., Encycl. 1: 222. 1783
Synonyms: Draba caroliniana Walter Draba caroliniana var. dolichocarpa O. E. Schulz Draba caroliniana var. hunteri Payson & H. St. John Draba caroliniana var. micrantha (Nuttall) A. Gray Draba caroliniana subsp. stellifera (O. E. Schulz) Payson & H. St. John Draba caroliniana var. umbellata Torrey & A. Gray Draba coloradensis (Michaux) Rafinesque Draba hispidula (Nuttall) Lunell Draba micrantha Draba reptans var. micrantha (Nuttall) Fernald Draba reptans subsp. stellifera (O. E. Schulz) Abrams Draba reptans var. stellifera (O. E. Schulz) C. L. Hitchcock Draba umbellata Tomostima caroliniana Tomostima hispidula Tomostima micrantha
Treatment appears in FNA Volume 7. Treatment on page 333. Mentioned on page 271, 272, 273, 334.

Annuals; scapose or subscapose. Stems (simple or few from, or distal to, base), unbranched, (0.1–)0.3–1.2(–1.6) dm, sparsely to densely pubescent proximally, trichomes 2 (or 3)-rayed, 0.1–0.6 mm, sometimes with simple or spurred ones, to 0.9 mm, distally usually glabrous, rarely with few trichomes. Basal leaves not rosulate; petiole obscure; blade elliptic or spatulate to obovate or suborbicular, 0.5–2.3(–3) cm × 1.5–8(–13) mm, margins entire, surfaces pubescent abaxially with stalked, 2–4-rayed trichomes, 0.1–0.5 mm, adaxially with simple trichomes, 0.6–1 mm, with stalked, 2-rayed ones, to 0.7 mm. Cauline leaves usually 0, rarely 1–3; sessile; blade similar to basal. Racemes (3–)5–12(–16)-flowered, ebracteate, (subumbellate), not elongated in fruit; rachis not flexuous, usually glabrous, rarely sparsely pubescent. Fruiting pedicels horizontal to divaricate-ascending, straight, (1–)2–7(–9) mm, glabrous or glabrate. Flowers: (late-season ones cleistogamous, apetalous); sepals oblong, 1.5–2.3 mm, pubescent, (trichomes simple); petals (rarely absent), white, spatulate, 2–4.5 × 1–1.5 mm; anthers ovate, 0.4–0.5 mm. Fruits linear to linear-oblong, plane, flattened, (5–)7–16(–20) × 1.2–2.3 mm; valves glabrous or pubescent, trichomes usually simple and antrorse, 0.1–0.3 mm, rarely with fewer, spurred or 2-rayed ones; ovules 32–88 per ovary; style 0.02–0.1 mm. Seeds oblong to ovoid, 0.5–0.8 × 0.3–0.5 mm. 2n = 16, 30, 32.

Phenology: Flowering Feb–Jun(-Aug).
Habitat: Rock outcrops, dry slopes and hillsides, prairies, glades, roadsides, disturbed sites
Elevation: 0-3000 m


V7 458-distribution-map.gif

Alta., B.C., Man., Ont., Sask., Ala., Ariz., Ark., Calif., Colo., Ga., Idaho, Ill., Iowa, Kans., Mass., Mich., Minn., Mo., Mont., Nebr., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., S.C., S.Dak., Tenn., Tex., Utah, Wash., Wis., Wyo.


Draba reptans is often confused with D. cuneifolia, but the two are easily separated. The rachises and pedicels of D. reptans are usually glabrous (rarely with a few isolated trichomes); those of D. cuneifolia are always densely pubescent. Interestingly, both species show parallel variations in chromosome number; it is currently unclear whether this variation is real or the result of misidentified specimens and/or erroneous counts.

Selected References


Lower Taxa

... more about "Draba reptans"
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
(Lamarck) Fernald +
Arabis reptans +
Alta. +, B.C. +, Man. +, Ont. +, Sask. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Ga. +, Idaho +, Ill. +, Iowa +, Kans. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Wash. +, Wis. +  and Wyo. +
0-3000 m +
Rock outcrops, dry slopes and hillsides, prairies, glades, roadsides, disturbed sites +
Flowering Feb–Jun(-Aug). +
Draba caroliniana +, Draba caroliniana var. dolichocarpa +, Draba caroliniana var. hunteri +, Draba caroliniana var. micrantha +, Draba caroliniana subsp. stellifera +, Draba caroliniana var. umbellata +, Draba coloradensis +, Draba hispidula +, Draba micrantha +, Draba reptans var. micrantha +, Draba reptans subsp. stellifera +, Draba reptans var. stellifera +, Draba umbellata +, Tomostima caroliniana +, Tomostima hispidula +  and Tomostima micrantha +
Draba reptans +
species +