Trichilia mazanensis J.F. Macbr., Publ. Field Mus. Nat, Hist., Bot. Ser.

Pennington, Terence D., 2016, Systematic Treatment Of American Trichilia (Meliaceae), Phytotaxa 259 (1), pp. 18-162 : 62-63

16. Trichilia mazanensis J.F. Macbr., Publ. Field Mus. Nat, Hist., Bot. Ser. 13 (3): 742 (1949); T. D.Penn., Fl. Neotrop. 28: 45 (1981). Type:— PERU. Loreto, Río Mazán , fl., Schunke 136 (holotype, F; isotypes, A, NY, US). Map 22

Illustration: FN28: 43, fig. 3 (1981).

Abbreviated Description. Indumentum of minute stellate hairs (×20) on young shoots and inflorescence, leaflets 7–9, alternate, mostly 8–15 cm long, 2.9–5(–7.2) cm broad, usually lanceolate, inflorescence 2–9 cm long, a dense thyrse, calyx of +/- free imbricate sepals, petals 5, free, 4–5 mm long, imbricate, filaments fused 1/2–2/3 their length, anthers 9–10, nectary a small annulus, ovary 3-locular, locules with 2 collateral ovules, fruit 2.5–3.3 cm long, 3-valved, ovoid, ellipsoid or obovoid, pericarp ca. 0.5 mm thick, densely puberulous with a mixture of simple and stellate hairs, seed solitary, surrounded by a free arillode.

MAP 22. Distribution of Trichilia mazanensis Macbride. Solid dots, distribution pre-1981, open dots new records 1981–2010.

Distribution & Ecology. River margins and periodically flooded forest of the Orinoco and Amazon drainage from Venezuela southwards to Colombia and Peru, and from Amapá to western Amazonian Brazil, not yet recorded from Ecuador.

Additional Collections Examined. VENEZUELA. Anzoategui: Río Mapire (NW0764), Rosales & Valles 189 (K). Bolívar: Municipio Sucre, Isla la Baraca, near Nichare (NW0664), Knab-Vispo 762 (NY); Cuenca media del Rio Paragua (NW0663), Stergios 10024 (K), 10933 (K). Amazonas: Atabapo, upper Rio Orinoco (NW0365), Aymard & Delgado 8045 (K); vicinity of Rio Coro-Coro, near airport of Yutaje (NW0566), Liesner et al. 10965 (MO). Depto. Rio Negro, R. Emoni (NW0266), Stergios et al. 8228 (K), 9912 (K), 15497 ( US); Rio Casiquiare, between Solano and Curimacare (NW0166), Stergios & Aymard 9038 (K).

PERU. Loreto: Maynas, San Alejandro, 1 hour below mouth of R. Napo (SW0372), Vásquez & Jaramillo 8 (K), 59 (MO); Prov. Loreto, San Antonio (SW0473), Vásquez & Jaramillo 3622 (K, MO, NY). BRAZIL. Acre: Municipio Plácido de Castro, Km 20, AC-40, Igarapé Visionário (SW1067), Rivero et al. 333 (K). Amazonas: Municipio Fonte Boa, near mouth of R. Jurua (SW0265), Cid Ferreira et al. 7364 (K); Municipio de Manaus, Flutuante de Catalão (SW0360), Ferreira 289 (K).

Relationships. On morphological grounds this species was considered to be closely related to T. euneura (FN28: 44 (1981)). The two species form an isolated pair sharing stellate indumentum, imbricate sepals and seed with superposed cotyledons, a combination that immediately distinguishes them from all other species of Trichilia . It is therefore surprising that this relationship is not confirmed by the ITS data, which does not even place it in sect. Trichilia . Further sampling of the species is required for confirmation of its position.