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(Last Modified On 10/23/2013)
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Species
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Draba wurdackii Al-Shehbaz
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Note
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TYPE: Peru. Amazonas: Prov. de Chachapoyas, upper slopes and summit of Cerro Campanario, 3,600- 3,900 m, 3 Aug. 1962, Wurdack 1577 (holotype, US #2404314).
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Distribution
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Peru
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Description
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Slender, suffrutescent perennial herbs. Lower stems woody, stramineous, to 1 mm wide, without foliar remains of previous years; upper stems leafy, stellate-pubescent, 3-5 cm long. Leaves oblong to elliptic, 3-10 mm long, 1-4 mm wide, scabrous, acute, denticulate, usually with 2 or 3 teeth on each side, cuneate to a sessile base; upper surface with subappressed simple trichomes to 0.8 mm long, these are mixed with short-stalked furcate or trifid trichomes; lower surface with predominantly subsessile or short-stalked, trifid trichomes mixed with smaller, fewer, cruciform trichomes, the rays unbranched. Inflorescences few-flowered, corymbose racemes, slightly elongated in fruit, the lower portion bracteate. Sepals erect, oblong, caducous, 2.5-3 mm long, rounded at apex, yellowish and scarious at margin, nonsaccate, sparsely hirsute with simple and furcate trichomes. Petals pale yellow, spatulate, not clawed, 3-3.5 mm long; ca. 1.3 mm wide. Filaments yellowish, erect, 2-2.2 mm long; anthers oblong, 0.4-0.5 mm long. Nectar glands confluent, subtending the bases of all filaments. Fruiting pedicels divaricate, straight, 3-6 mm long, pubescent with trifid trichomes. Fruits narrowly oblong, compressed, 6-9 mm long, 2-2.5 mm wide; valves obtuse at both ends, puberulous or hirsutulous with simple trichomes to 0.2 mm long; septum complete; style 0.4-0.5 mm long; stigma entire. Seeds ovate, compressed, ca. 1.2 x 0.8 mm.
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Habit
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herbs
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Note
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Draba wurdackii is most closely related to D. peruviana, from which it is easily distinguished in having slender stems without fohar remains, lower leaf surfaces with predominantly trifid trichomes with unbranched rays, yellow petals 3-3.5 mm long, narrowly oblong fruits with obtuse valves, and styles 0.4-0.5 mm long. In contrast, D. peruviana is a subshrub that has stout stems with foliar remains, lower leaf surfaces with stellate trichomes, of which some rays are furcate or trifid, white petals 7-10 mm long, broadly oblong (rarely ovoid or subelliptic) fruits with acute valves, and styles 1.5-3 mm long.
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