Flora of North America species comparison

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Draba alpina

Draba mogollonica

alpine Draba

Mogollon Mountain Draba
Habit Perennials; (cespitose); caudex branched (covered with persistent leaves or leaf remains); scapose. Annuals, biennials, or, rarely, perennials; (short-lived); not scapose.
Stems

unbranched, (0.3–)0.5–1.7(–2.8) dm, pubescent throughout, trichomes simple and 2-rayed, 0.3–0.8 mm, with 3–5-rayed ones, 0.1–0.3 mm.

usually branched, (0.6–)1.2–2.8(–3.6) dm, pubescent proximally, glabrous distally, trichomes simple, 0.3–1.3 mm, and 2–4-rayed, 0.1–0.6 mm.
Basal leaves

rosulate; petiolate;

petiole base (not thickened), ciliate, (trichomes simple, 0.3–1 mm);

blade oblanceolate to obovate or lanceolate to oblong, 0.8–3(–4.5) cm × 2.5–6(–9) mm, margins entire, surfaces abaxially pubescent with stalked, 2–4-rayed trichomes, 0.1–0.5 mm, with simple ones (midvein obscure, not thickened), adaxially glabrous or sparsely pubescent with simple and stalked, 2–4-rayed trichomes.

rosulate;

petiole (0–2 cm), densely pubescent, (trichomes simple and 2–4-rayed, not ciliate);

blade spatulate to obovate or oblanceolate, (1.5–)3–8(–10) cm × 7–25(–33) mm, margins dentate to denticulate, surfaces pubescent with long-stalked, cruciform, and fewer 2- or 3-rayed trichomes, 0.1–0.6 mm.
Cauline leaves

0.

1–3;

sessile;

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

6–18-flowered, ebracteate, considerably elongated in fruit;

rachis not flexuous, pubescent as stem.

12–40(–51)-flowered, ebracteate, elongated in fruit;

rachis not flexuous, usually glabrous, rarely proximally with relatively few trichomes.
Flowers

sepals (purplish tinged), narrowly ovate, 2.5–3 mm, pubescent, (trichomes simple and fewer, stalked, 2-rayed);

petals bright yellow, narrowly obovate, 3.5–5 × 1.7–2.5 mm;

anthers ovate, 0.3–0.4 mm.

sepals oblong, 2.5–3.5 mm, sparsely pubescent, (trichomes simple and 2–4-rayed);

petals yellow, spatulate, (5–)6–8.5 × 2.2–3.5 mm;

anthers oblong, 0.7–0.9 mm.
Fruiting pedicels

ascending to divaricate-ascending, straight or, sometimes, slightly curved upwards, 4–14(–30) mm, pubescent, trichomes simple and 2–4-rayed.

horizontal to divaricate, straight, (6–)9–18(–22) mm, usually glabrous, rarely sparsely pubescent as stem proximally.
Fruits

elliptic, plane, flattened, 6–10 × 2–3 mm;

valves glabrous or glabrescent, trichomes simple, (not confined to replum);

ovules 12–24 per ovary;

style 0.2–0.3 mm (stigma about as wide as style).

linear-elliptic to elliptic-lanceolate, slightly twisted, flattened, 6–19 × 2.5–3.5 mm;

valves glabrous or pubescent, trichomes simple and short-stalked, 2(–4)-rayed, 0.07–0.3 mm;

ovules 24–36 per ovary;

style (0.8–)1–2.2 mm.
Seeds

(pale brown), ovoid, 0.9–1.3 × 0.6–0.9 mm.

oblong, 1–1.4 × 0.7–0.8 mm.
2n

= 80.

= 22.

Draba alpina

Draba mogollonica
Phenology Flowering Jun–Aug. Flowering Apr–May.
Habitat Moist tundra and ridges, sand and gravel flats or beaches Rock outcrops and rocky slopes in oak-pine woodlands and mixed conifer communities
Elevation 0-1000 m (0-3300 ft) 1500-2300 m (4900-7500 ft)
Distribution
from FNA
LB; MB; NU; ON; QC; Greenland; Europe (Finland, Norway, Russia, Sweden)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM
[BONAP county map]
Discussion

The synonymy above includes two North American names overlooked by C. L. Hitchcock (1941) and R. C. Rollins (1993). Draba alpina was broadly delimited by O. E. Schulz (1927) and included 17 varieties, some of which (e.g., corymbosa, oxycarpa, pilosa) are recognized herein as distinct species. The name D. alpina was so misapplied that it was used for any circumpolar or alpine, scapose, yellow-flowered, perennial Draba. Various chromosome numbers (e.g., 2n = 64, 80, 112, 120; S. I. Warwick and I. A. Al-Shehbaz 2006) have been reported for the species. As circumscribed here, it has the narrow distribution outlined above and includes plants with 2n = 80. Reports of the species from Alaska, Canadian Northwest Territories and Yukon, Siberia, eastern Asia, Russian Far East, and the Central Asian republics are either suspect or very unlikely. The entire D. alpina complex (including the above three species, D. glacialis Adams, D. macounii, etc.) is in need of critical molecular, cytological, and morphological study.

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

Draba mogollonica is distributed in New Mexico primarily in the Mogollon and neighboring mountains in Catron, Grant, Sierra, and Socorro counties. It is reported herein for the first time from Arizona from Greenlee County, based on Barneby 2297 (NY), Rollins & Rollins 93113 (CAS, GH), and Windham 2918 (MO, UT). The only published chromosome count (n = 16, compiled in S. I. Warwick and I. A. Al-Shehbaz 2006) is erroneous; counts by M. D. Windham (unpubl.) from five populations representing all of the above-mentioned counties in Arizona and New Mexico consistently agree on n = 11.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 290. FNA vol. 7, p. 320.
Parent taxa Brassicaceae > tribe Arabideae > Draba Brassicaceae > tribe Arabideae > Draba
Sibling taxa
D. abajoensis, D. albertina, D. aleutica, 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. 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. 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
Synonyms D. alpina var. hydeana, D. alpina var. inflatisiliqua
Name authority Linnaeus: Sp. Pl. 2: 642. (1753) Greene: Bot. Gaz. 6: 157. (1881)
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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