Flora of North America species comparison

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Draba paucifructa

Draba simmonsii

Charleston Mountain Draba
Habit Perennials; caudex simple or branched (not fleshy, usually with some persistent leaf remains); sometimes scapose. Perennials; caudex branched (with persistent leaf bases and petioles); scapose.
Stems

unbranched, (0.1–)0.3–0.9 dm, glabrous throughout or sparsely pubescent proximally, trichomes simple and 2–6-rayed, 0.1–0.5 mm.

unbranched, (0.15–)0.3–1.1(–1.3) dm, often pubescent throughout, sometimes sparsely pubescent distally, trichomes stalked, 2–4-rayed, and fewer, simple ones, 0.1–0.3(–0.6) mm.
Basal leaves

rosulate;

petiolate;

petiole (0–0.5 cm), ciliate throughout;

blade oblanceolate to obovate, 0.4–1.7(–2.3) cm × 1.6–4(–6) mm, margins usually entire, rarely denticulate, (sparsely ciliate, trichomes simple, 0.3–0.8 mm), surfaces pubescent, abaxially with stalked, (2–)4(–6)-rayed trichomes, (0.05–)0.1–0.6 mm, adaxially with simple and fewer, stalked, 2–4-rayed ones.

(not imbricate); rosulate;

petiolate;

petiole (base somewhat thickened), margin ciliate, (trichomes simple, 0.5–1 mm);

blade oblong to oblong-lanceolate, 0.5–1.6 cm × 2–5 mm, margins entire (apex subacute to obtuse), surfaces pubescent throughout or glabrous adaxially, with simple and stalked, 2–4(–6)-rayed, stellate to subdendritic trichomes.
Cauline leaves

0 or 1;

sessile;

blade ovate to lanceolate, margins entire, surfaces pubescent as basal.

0.
Racemes

(2–)4–9(–12)-flowered, ebracteate, elongated in fruit;

rachis slightly flexuous, glabrous.

(2–)4–10(–14)-flowered, ebracteate, slightly elongated in fruit;

rachis not flexuous (straight), pubescent as stem.
Flowers

sepals ovate, 1.2–1.7 mm, pubescent, (trichomes simple and short-stalked, 2- or 3-rayed);

petals yellowish (quickly fading white), spatulate, 1.8–2.2 × 0.6–1 mm;

anthers ovate, 0.25–0.3 mm.

sepals (purplish green), oblong, (2.5–)2.8–3.5(–3.8) mm, pubescent, (trichomes simple and sometimes short-stalked, 2-rayed);

petals pale yellow, narrowly obovate, (sides non-parallel), (3.5–)3.8–5.5(–5.8) × (2.5–)2.8–4(–4.6) mm, (emarginate);

anthers ovate, ca. 0.5 mm.
Fruiting pedicels

divaricate-ascending, straight, 2–5(–8) mm, glabrous.

divaricate, straight, 2.5–10 mm, pubescent as stem.
Fruits

elliptic to linear lanceolate, plane, flattened, 5–10(–12) × 1.7–2(–2.5) mm;

valves glabrous;

ovules 20–30 per ovary;

style 0.08–0.2 mm.

lanceolate, plane, slightly flattened, 5.5–9(–11) × 2.3–3.8 mm;

valves pubescent, trichomes simple, sometimes with fewer, 2-rayed ones, 0.1–0.3 mm;

ovules 16–24(–28) per ovary;

style 0.1–0.3 mm (stigma as wide as style).
Seeds

oblong, 0.9–1.2 × 0.5–0.8 mm.

(dark brown), oblong-ovate, 1–1.3 × 0.7–0.8 mm.
2n

= 40.

Draba paucifructa

Draba simmonsii
Phenology Flowering Jun–Jul. Flowering late Jun–Jul.
Habitat Moist, shaded slopes among limestone and dolomite rocks Dry open ground, open patches in meadows or heath vegetation, outwash plains
Elevation 2600-3500 m (8500-11500 ft) 0-100 m (0-300 ft)
Distribution
from FNA
NV
[BONAP county map]
from FNA
NT; NU
[BONAP county map]
Discussion

Of conservation concern.

Draba paucifructa is known from the Charleston Mountains in Clark County. M. D. Windham (2004) suggested that it is an allopolyploid resulting from hybridization between D. albertina and D. lonchocarpa, and he discussed the morphological features that distinguish this species from its putative parents.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 327. FNA vol. 7, p. 337.
Parent taxa Brassicaceae > tribe Arabideae > Draba Brassicaceae > tribe Arabideae > Draba
Sibling taxa
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctica, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. pauciflora, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. simmonsii, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctica, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. pauciflora, D. paucifructa, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis
Synonyms D. alpina var. gracilescens
Name authority Clokey & C. L. Hitchcock: Madroño 5: 127. (1939) Elven & Al-Shehbaz: Novon 18: 326. (2008)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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