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Ammopiptanthus mongolicus

Description from Flora of China

Piptanthus mongolicus Maximowicz ex Komarov, Trudy Glavn. Bot. Sada 34: 33. 1920; Ammopiptanthus nanus (Popov) S. H. Cheng; P. nanus Popov.

Evergreen shrubs, 1.5-2 m tall; bark yellowish brown. Stems terete, weakly ridged, gray puberulent at first, glabres­cent. Leaves 1- or 3-foliolate; stipules small, triangular, adnate to petiole, silvery tomentose; petiole 4-15 mm; leaflets rhom­bic-elliptic or broadly elliptic to broadly ovate, 1.5-4 × 0.6-2.4 cm, densely silvery tomentose on both surfaces, lateral veins in­conspicuous, base broadly cuneate to rounded, apex obtuse, often mucronate. Flowers 4-15, in short dense terminal ra­cemes; bracts ovate, 5-6 mm, deciduous; pedicels ca. 1 cm, subglabrous, with 2 bracteoles at midpoint. Calyx 5-7 mm. Corolla yellow, ca. 2 cm, petals long clawed. Ovary stipitate, glabrous. Legume linear-oblong, 3-8 × 1-2 cm, flat, apex acute to obtuse; stipe 8-10 mm. Seeds 2-5, orbicular-reniform, ca. 6 mm in diam. Fl. Apr-Jun, fr. May-Aug.

Two species have been recognized, but the differences between them are of degree only and do not appear to merit recognition of more than one rather variable species. Many species of arid areas vary considerably in their morphology according to water availability, grazing, and season, and this species appears to be no exception.

Sand dunes, gravel slopes, terraces beside ravines. Gansu, Nei Mongol, Ningxia, W Xinjiang (Kashi) [Kazakhstan, Kyrgyzstan, S Mongolia].


 

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