Stryphnodendron levelii R.S. Cowan (1958: 144)

Scalon, Viviane Renata, Paula-Souza, Juliana De, Lima, Alexandre Gibau De & Souza, Vinicius Castro, 2022, A synopsis of the genus Stryphnodendron (Fabaceae, Caesalpinioideae, mimosoid clade), Phytotaxa 544 (3), pp. 227-279 : 250

17. Stryphnodendron levelii R.S. Cowan (1958: 144) .

— Type: VENEZUELA.Ter.Fed. Amazonas, Cano Guazuriapana, Rio Atabapo near San Fernando de Atabapo , 16 May 1954, Level 104 (holotype NY 3369 !, isotype F!, K!, US!, VEN)

Shrubs to treelets 3–8 m tall. Leaves with 3–4 pairs of pinnae; (5–)6–10 pairs of leaflets; petiolar nectary 1, verruciform with an elongated base; leaflets (8–)11-18 × (6–) 9–11 cm, usually oblong to oblong-rhombic, rarely ovate, distal leaflets obovate, proximal sometimes elliptic, chartaceous, discolor, glabrous on both surface, unilateral tuft of trichomes on the lower surface present, usually prolonged along the midrib, rarely absent. Inflorescences of simple thyrsi; cymulae of solitary to geminate spikes; spikes (5–) 6.5–8 cm long. Flowers diclinous, corolla tube sparsely pubescent, lobes yellow-pubescent, yellowish. Fruit a nucoid legume, straight to slightly curved, shortly dilated at the base, flat-compressed, usually slightly constricted between the seeds, seeds slightly prominent, valves coriaceous, inconspicuously nerved.

Remarks: — Stryphnodendron levelii belongs to a group of Amazonian species with medium-sized leaflets, yellowish inflorescences and indumentum in calyx and corolla, distinguished by the features shown in table 5.

Distribution and habitat: — Stryphnodendron levelii is endemic to the region of the Atabapo/ Venezuela river in Southeastern Venezuela, occurring in shrubby grass savannas, generally at low altitudes (95 to 130m), and small patches of predominantly herbaceous-shrub vegetation surrounded by lowland forests (matas de terras baixas).

Conservation: —Endangered (EN B1a,b(i,ii,iii)+2ab(i,ii,iii)) [AOO= 12.000 km 2, EOO= 59.399 km 2]. Stryphnodendron levelii occurs in a very restricted area subject to constant disturbance due to the expansion of anthropogenic activities.

Phenology: — Stryphnodendron levelii was collected with flowers in May, with immature fruits in September and mature in February, March and May.

Selected specimens examined: — VENEZUELA. Territorio Federal Amazonas, Depto. Atabapo: San Fernando de Atabapo, Right bank of Cano Cupueni , 0.5 km above mouth, 16 February 1954, fr., B. Maguire et al. 37695 ( NY, US).