Flora of North America species comparison

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Draba heilii

Draba yukonensis

Yukon whitlowgrass
Habit Perennials; (densely cespitose); caudex few-branched (compact, with persistent, thickened leaves); not scapose. Perennials; (short-lived); caudex simple or branched (with persistent leaf remains); not scapose.
Stems

unbranched or branched distally, 0.3–0.7 dm, glabrous throughout or, rarely, pilose, trichomes simple and stalked, 2-rayed, 0.2–0.5 mm.

branched, 0.4–2 dm, pubescent throughout, trichomes simple, 0.3–1.2 mm, and 2–6-rayed, 0.05–0.6 mm.
Basal leaves

(persistent, imbricate); rosulate; undifferentiated into blade and petiole (becoming indurate at base);

blade linear-lanceolate, 0.5–0.8 cm × 1–1.5(–2) mm, margins entire, surfaces glabrous or, rarely, pilose with simple and stalked, 2-rayed trichomes, (margins ciliate with simple and, rarely, 2-rayed setiform trichomes, 0.5–1.3 mm, midvein prominent).

rosulate;

subsessile;

blade oblanceolate to narrowly so, 0.3–1 cm × 0.5–2 mm, margins entire, (ciliate, trichomes simple, to 1.3 mm), surfaces pubescent, abaxially with (rigid), simple and 2-rayed trichomes, 0.4–1.2 mm, sometimes with short-stalked, 3–6-rayed ones, 0.1–0.3 mm, adaxially with simple trichomes.
Cauline leaves

6–8;

sessile;

blade linear-oblong, 0.5–0.8 cm × 1–2 mm (widest about base), margins entire, (ciliate).

1–3;

sessile;

blade ovate to oblong, margins entire, surfaces pubescent as basal.
Racemes

10–26-flowered, ebracteate, elongated in fruit;

rachis not flexuous, usually glabrous, rarely pubescent, (trichomes non-crisped, simple and 2-rayed).

5–20-flowered, ebracteate, considerably elongated in fruit;

rachis not flexuous, pubescent as stem.
Flowers

sepals ovate, 1.7–2.7 mm, usually glabrous, rarely pilose, (trichomes simple);

petals yellow, oblong-oblanceolate, 4–6 × 1.5–2 mm;

anthers oblong, 0.5–0.6 mm.

sepals ovate, 1.2–1.6 mm, pubescent, (trichomes simple and 2–4-rayed);

petals white, spatulate, 1.5–2 × 0.7–0.8 mm;

anthers ovate, ca. 0.2 mm.
Fruiting pedicels

ascending, straight, 3–5(–7) mm, usually glabrous, rarely pilose, (trichomes simple and 2-rayed, stalked).

erect to ascending, straight, 0.5–3 mm, pubescent as stem.
Fruits

narrowly lanceolate, twisted 1/2 turn or plane, flattened, 7–10 × 1.3–1.6 mm;

valves glabrous;

ovules 16–20 per ovary;

style 0.7–1.3 mm.

ovoid to oblong, plane, not flattened, 2–5 × 1.5–2 mm;

valves pubescent, trichomes short-stalked, 4- or 5-rayed, 0.05–0.3 mm;

ovules 36–52 per ovary;

style 0.1–0.3 mm.
Seeds

ovoid, 1 × 0.6 mm.

oblong, 0.6–0.8 × 0.3–0.4 mm.

Draba heilii

Draba yukonensis
Phenology Flowering Jun–Jul. Flowering late May–Jun.
Habitat Alpine tundra Open stony ridges on ancient beach in grassy areas and aspen stands
Elevation ca. 3700 m (ca. 12100 ft) ca. 600 m (ca. 2000 ft)
Distribution
from FNA
NM
[BONAP county map]
from FNA
YT
[BONAP county map]
Discussion

Draba heilii is restricted to Mora and Rio Arriba counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Draba yukonensis is known only from Kluane National Park, southwestern Yukon Territory.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 311. FNA vol. 7, p. 346.
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. 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. 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. 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. zionensis
Name authority Al-Shehbaz: Harvard Pap. Bot. 14: 83, fig. 1. (2009) A. E. Porsild: Publ. Bot. (Ottawa) 4: 37, plate 7. (1975)
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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