Stenodrepanum Harms, Notizbl. Bot. Gart. Berlin-Dahlem 7: 500. 1921

Gagnon, Edeline, Bruneau, Anne, Hughes, Colin E., de Queiroz, Luciano Paganucci & Lewis, Gwilym P., 2016, A new generic system for the pantropical Caesalpinia group (Leguminosae), PhytoKeys 71, pp. 1-160 : 68

22. Stenodrepanum Harms, Notizbl. Bot. Gart. Berlin-Dahlem 7: 500. 1921 Figs 34I-K , 36

Type.

Stenodrepanum bergii Harms.

Description.

Suffrutescent shrub, (10-) 20-40 cm tall, with bud-bearing and occasionally tuber-forming roots; glabrous, with globose sessile glands scattered along the branches. Stipules ovate, membranous, 2.5-4 × 2-2.5 mm. Leaves alternate, bipinnate, pinnae in 1-3 pairs plus a single terminal pinna, 4-10 cm long; leaflets in 5-9 pairs per pinna, obtuse, 5-12 × 2-5.5 mm, with a crenulate, glandular margin, and embedded glands on the lower surface. Inflorescence a lax, terminal raceme, 4-14 cm long. Flowers bisexual, zygomorphic; calyx comprising a hypanthium and 5 sepals (these not persisting in fruit), glabrous, glandular, the lower cucullate sepal covering the other four in bud; petals 5, free, yellow, the median petal with red markings, obovate, with stipitate glands on the dorsal surface; stamens 10, free, filaments pubescent and glandular; ovary glandular. Fruit a linear to slightly falcate, cylindrical, torulose pod, 30-60 × 2-2.5 mm, 1-5-seeded. Seeds ovoid.

Geographic distribution.

A monospecific genus endemic to central and western Argentina.

Habitat.

Subtropical wooded grassland and scrub, especially close to salt pans.

Etymology.

From steno - (Greek: narrow) and drepano - (Greek: sickle), in allusion to the narrow sickle-shaped fruit.

References.

Ulibarri (1979, 2008); Kiesling et al. (1994: 285); Caponio et al. (2012); Nores et al. (2012).

Figures

Figure 34. Balsamocarpon brevifolium Clos. A branch with inflorescence and fruit (M. F. Gardner, Chile, Gardner & Knees 5825 (E )) B fruits with persistent calyx, C habit (P. Baxter, Chile, Baxter et al. DCI 1859 (E )). Zuccagnia punctata Cav. D flowers E fruits (I. Specogna, Flora mendocina (http: // www. floramendocina. com. ar /), Mendoza, Argentina, unvouchered). Hoffmannseggia arequipensis Ulibarri F fruits with persistent calyx, and inflorescence (C. E. Hughes, Arequipa, Peru, Hughes et al. 2342 (FHO )). Hoffmannseggia minor (Phil.) Ulibarri, G habit and inflorescence (G. P. Lewis, Bolivia, unvouchered). Hoffmannseggia humilis (Mart. & Galeotti) Hemsl. H fruit with persistent sepals (J. Neff, Puebla, Mexico, unvouchered). Stenodrepanum bergii Harms I habit J inflorescence K fruit (R. H. Fortunato, Argentina, Fortunato 9144 (BAB )).

Figure 36. Stenodrepanum bergii Harms. A habit B leaflets C glands on the margin of the leaflets D flower E sepals with glands F apical glands of the sepals G lower cucullate sepal H glands on the petals I fruit J position of a seed in the fruit. A - H from Piccini-Leguizamon 1970 I, J from Soriano 787. A drawn by G. A. Larsen, B-J drawn by Emilio A. Ulibarri, originally published in Darwiniana, vol. 21 (nos. 2 - 4), page 402 (1978).