Draba reptans

(Lamarck) Fernald

Rhodora 36: 368. 1934.

Endemic
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

Distribution

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.

Discussion

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

None.

Lower Taxa

None.

"not elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Draba reptans"
32 +, 30 +  and 16 +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
(Lamarck) Fernald +
sessile +  and petiolate +
Arabis reptans +
appendaged +  and unappendaged +
2.3 cm23 mm <br />0.023 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
not +  and auriculate +
0.5 cm5 mm <br />0.005 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
lobed +, toothed +  and entire +
spatulate;obovate or suborbicular +
much smaller +  and reduced +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
well-differentiated +
emarginate +  and entire +
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 +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
not basally +  and dilated +
actinomorphic +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
spreading +, ascending +  and erect +
spatulate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
latiseptate +, twisted +  and sessile +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
indehiscent +  and dehiscent +
0.7 cm7 mm <br />0.007 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
flattened +, plane +, linear +  and linear-oblong +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
Rock outcrops, dry slopes and hillsides, prairies, glades, roadsides, disturbed sites +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
stalked +, spurred +  and simple +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
purple +, pink +, orange +, yellow +  and white +
rudimentary +
cruciform +
Flowering Feb–Jun(-Aug). +
trinucleate +  and 3(-11)-colpate +
ebracteate;(3-)5-12(-16)-flowered +
ascending +  and erect +
slender +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
straight +  and not flexuous +
horizontal +  and divaricate-ascending +
glabrate +, glabrous +  and pubescent +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
oblong +  and ovoid +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and caducous +
distinct +
spreading +, ascending +  and erect +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.23 cm2.3 mm <br />0.0023 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 +
procumbent +  and decumbent +
prostrate +  and decumbent +
usually erect +  and ascending +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.002 cm0.02 mm <br />2.0e-5 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
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 +
simple +  and stalked +
cruciform +  and forked +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
coiled +, 1-7-veined +  and veined +
pubescent +  and glabrous +
anastomosing +
subscapose +  and scapose +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +