Stryphnodendron racemiferum (Ducke) W.A. Rodrigues (1969: 438)

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 : 265

30. Stryphnodendron racemiferum (Ducke) W.A. Rodrigues (1969: 438) .

≡ Piptadenia racemifera Ducke (1930: 124) .—Type: BRAZIL.Amazonas, Maués, Rio Curuçá, 16 December 1927, Ducke s.n. (holotype RB 20188!, isotypes U!, US!)

Trees (5–)10–25(–35) m tall, trunk grayish; branch nectaries absent. Leaves with 2(–3) pairs of pinnae, opposite; 2–4 pairs of leaflets, opposite; petiolar nectary 1, verruciform; leaflets (6–)7–10.5(–13) × (2–)2.8–5.5(–7) cm, apex apiculate to usually caudate, margin flat, coriaceous to subcoriaceous, concolor, glabrous on both surfaces, unilateral tuft of trichomes on lower surface absent. Sinflorescence a diplothyrsus; cymulae of solitary, geminate to ternate spikes; spike (5–) 9–10 cm long; spike prophylls late deciduous to persistent, 2–3 mm long. Flowers monoclinous, whitish, greenish yellow to yellowish, anther gland sessile. Fruit a nucoid legume, straight to usually slightly curved, subturgid, 6.5–16 × 1.6–2.6 cm, valves subcoriaceous to coriaceous, light-brown to reddish dark-brown and ferruginouspulverulent, glabrescent ( Fig. 1B ).

Vernacular names: — Ingarana.

Distribution and habitat: —This species occurs in terra firme forests, mostly in non-flooded vertente forests (on a hill landscape, with clay soils in the highest parts and sandy soils in the lowest parts) or in baixio forests, generally associated with sandy soils with accumulation of sediments in the alluvial plains along of the igarapés. The current distribution of Stryphnodendron racemiferum is restricted to the Brazilian territory, in the phytogeographic provinces of Roraima, Manaus and Jari-Trombetas (Roraima, Amazonas and Pará states), all in the Central-Eastern Amazon. The specimens registered in Rio de Janeiro (Rio de Janeiro state) are cultivated trees at the Brazilian Agricultural Research Corporation (EMBRAPA) for studies of nodulation, grown from seeds collected in Porto Trombetas/ PA.

Conservation: —Near Threatened (NT) [AOO= 32.000 km 2, EOO= 27,268.978 km 2].

Phenology: —This species was collected with flowers from June to January (except July and September), specimens with fruits were collected from July to March (except September, October, and December).

Selected specimens examined: — BRAZIL. Amazonas : Manaus-Itacoatiara Highway, Reserva Florestal Ducke. Km 26. Mata on terra firme, 21 November 1966, fl., G.T. Prance et al. 3613 (F, INPA, NY, R, US) . Manaus , Estrada Manaus-Itacoatiara, km 200, 30 July 1968, fr., W. Rodrigues et al. s.n., INPA 21328, NY, RFA 29759 ).

Figures

FIGURE 1. Tree species of Stryphnodendron. A. Stryphnodendron pulcherrimum (Willd.) Hochr.; B. Stryphnodendron racemiferum (Ducke) W.A.Rodrigues; C. Stryphnodendron coriaceum Benth.; D. Stryphnodendron adstringens (Mart.) Coville; E. Stryphnodendron rotundifolium var. rotundifolium Mart.; F. Stryphnodendron rotundifolium var. villosum (Benth.) Scalon; G. Stryphnodendron roseiflorum (Ducke) Ducke.