Flora of North America species comparison

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Draba yukonensis

Draba heilii

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

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

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.
Basal leaves

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.

(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).
Cauline leaves

1–3;

sessile;

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

6–8;

sessile;

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

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

rachis not flexuous, pubescent as stem.

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

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

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.

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.
Fruiting pedicels

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

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

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.

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.
Seeds

oblong, 0.6–0.8 × 0.3–0.4 mm.

ovoid, 1 × 0.6 mm.

Draba yukonensis

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

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.)

Draba heilii is restricted to Mora and Rio Arriba counties.

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