Flora of North America species comparison

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Draba aureola

Draba novolympica

alpine whitlow-grass, golden alpine Draba, golden Draba, great alpine whitlow-grass, Mt. Lassen Draba, Mt. Lassen Draba whitlow-grass, Mt. Lassen whitlow-grass

Mt. Olympic Draba, Olympic Draba, Olympic Mountains Draba, Payson's Draba, Payson's whitlow-grass, Trelease's Draba, Trelease's whitlow-grass
Habit Perennials; (short-lived); caudex simple or branched (poorly developed, with persistent dry leaves); not scapose. Perennials; (cespitose, densely pulvinate); caudex branched (covered with persistent leaves, branches creeping, sometimes terminating in sterile rosettes); scapose.
Stems

unbranched or branched, 0.3–1.5 dm, hirsute throughout, trichomes simple and long-stalked, 2–4-rayed, 0.2–1.5 mm.

unbranched, 0.05–0.4 dm, densely pubescent throughout, trichomes simple, 0.4–0.8 mm, and stalked, 2–5-rayed, 0.1–0.5 mm.
Basal leaves

(forming dense clusters); rosulate;

sessile;

blade oblanceolate to linear, (0.7–)1–2.5(–3.2) cm × 2–3.5(–5) mm, margins entire, (ciliate, trichomes simple and 2-rayed, 0.5–1.5 mm), surfaces densely hirsute, abaxially with stalked, 3–5-rayed trichomes, 0.1–0.5 mm, adaxially with simple and long-stalked, 2-rayed trichomes, to 1 mm, with smaller, 3–5-rayed ones.

(densely imbricate); rosulate;

sessile;

blade oblong to linear-oblanceolate, 0.2–0.8 cm × 0.5–1.5 mm, margins entire, (ciliate, trichomes simple and spurred, 0.3–1.2 mm), surfaces densely pubescent, abaxially with stalked, 2–12-rayed stellate trichomes, 0.1–0.6 mm, adaxially with simple and 2-rayed ones, 0.3–0.8 mm.
Cauline leaves

5–33;

sessile;

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

0.
Racemes

12–83-flowered, ebracteate or proximalmost 1–9 flowers bracteate, slightly or not elongated in fruit;

rachis not flexuous, hirsute as stem.

2–12-flowered, ebracteate, slightly elongated in fruit;

rachis not flexuous, pubescent as stem.
Flowers

sepals ovate, 2.5–4 mm, glabrous;

petals bright yellow, linear to linear-oblanceolate, 4–6 × 0.5–1(–1.2) mm;

anthers narrowly oblong, 0.8–1 mm.

sepals oblong, 1.5–2.5 mm, pubescent, (trichomes simple and short-stalked, 2–4-rayed);

petals bright yellow, oblanceolate to spatulate, 2–3.5(–4) × 1.5–2 mm;

anthers oblong, 0.5–0.6 mm.
Fruiting pedicels

horizontal to divaricate, usually straight, rarely curved upward, (3–)5–12(–19) mm, hirsute as stem.

divaricate-ascending, straight, 1–5 mm, pubescent, trichomes simple (0.3–0.9 mm) and stalked, 2–5-rayed (0.1–0.5 mm).
Fruits

oblong or, rarely, oblong-ovate, plane, flattened, (6–)9–14(–16) × 3–5 mm;

valves pubescent, trichomes stalked, 2–4-rayed, 0.07–0.5 mm;

ovules 10–20 per ovary;

style (0.6–)1–1.6(–2) mm.

often ovoid, plane, slightly inflated basally (symmetric), (2.5–)3–4(–5) × 1.5–3.5 mm;

valves densely pubescent, trichomes 2–6-rayed, 0.05–0.4 mm, occasionally some simple;

ovules 4–8(–12) per ovary;

style 0.2–0.6(–0.8) mm.
Seeds

oblong, 1.4–1.9 × 0.8–1.1 mm.

oblong, 1.2–1.8 × 0.8–1.1 mm.
2n

= 20.

= 42.

Draba aureola

Draba novolympica
Phenology Flowering Jul–Aug. Flowering Jun–Aug.
Habitat Open conifer forests, alpine meadows and moraines, talus slopes Alpine crests, open knolls, fellfields, talus, weathered shale, calcareous shale scree, rocky grounds and cliffs, subalpine conifer forests
Elevation 2200-3200 m (7200-10500 ft) 1500-3700 m (4900-12100 ft)
Distribution
from FNA
CA; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Draba aureola is known from Lassen, Shasta, and Siskiyou counties in California, Deschutes County in Oregon, and Lewis and Pierce counties in Washington.

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

Draba novolympica is the same taxon that C. L. Hitchcock (1941) and R. C. Rollins (1993) called D. paysonii var. treleasei, and G. A. Mulligan (2002) called D. paysonii. The two are amply distinct and should be recognized as separate species. Draba novolympica is easily distinguished from D. paysonii by having fruit valves pubescent with 2–6-rayed (occasionally some simple) trichomes 0.05–0.4 mm, sepals 1.5–2.5 mm, petals 2–3.5(–4) × 1.5–2 mm, fruits (2.5–)3–4(–5) × 1.5–3.5 mm, styles 0.2–0.6(–0.8) mm, and ovules 1.2–1.8 × 0.8–1.1 mm. By contrast, D. paysonii has fruit valves pubescent with simple and 2-rayed (some 4- or 5-rayed) trichomes (0.2–)0.4–1 mm, sepals 2.8–3.5 mm, petals (4–)5–6 × (1.5–)2–3 mm, fruits (5–)6–9 × (3–)3.5–5 mm, styles (0.6–)0.8–1.2 mm, and ovules 1.7–2.2 × 1–1.4 mm.

Both R. C. Rollins (1993) and N. H. Holmgren (2005b) indicated that Draba novolympica (as D. paysonii var. treleasei) occurs in Alaska and Yukon, but we have not seen any material from there, and it is likely that their records were based on misidentified plants. Previous reports of D. paysonii from Canada (e.g., G. A. Mulligan 1971b) pertain instead to D. novolympica.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 295. FNA vol. 7, p. 323.
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. 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. 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. 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
Synonyms D. aureola var. paniculata D. barbata var. treleasei, D. paysonii var. treleasei
Name authority S. Watson: in W. H. Brewer et al., Bot. California 2: 430. (1880) Payson & H. St. John: Proc. Biol. Soc. Wash. 43: 113. (1930)
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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