Monographs Details: Pseudobombax croizatii A.Robyns
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Malvaceae
Description:Species Description - Shrub or small tree, 3-8 m tall, deciduous, the branchlets glabrous and whitish-pruinose. Leaves grouped toward the apex of the branchlets, compound-digitate, 3- or usually 5-foliolate, the petiole terete, 7-17.5 cm long, the apex enlarged-angulate and up to 1.2 cm wide, glabrous or the apex sometimes sparsely and minutely reddish-lepidote or scatteringly stellate-puberulous, often whitish-pruinose; leaflets inarticulate, shortly petiolulate, the petiolule 2-5 mm long, canaliculate above, the blade elliptic to more or less obovate, attenuate and decurrent at the base, rounded to acute and sometimes subretuse or inconspicuously mucronulate at the apex, 7-19 cm long and 4.5-11.5 cm wide, chartaceous, glabrous above, sparsely and minutely stellate puberulous along the prominent midvein and prominulous lateral veins below. Flowers axillary, solitary or in 3-flowered, uni-pared cymes, up to 12 cm long, the pedicel 1-2 cm long, terete, rather thick, glabrous and 3-bracteolate; receptacle provided with 1 whorl of glands, glabrous; calyx cupuliform-campanulate, truncate at the apex, about 6-7 mm long and 1 cm wide, purplish and glabrous outside, sericeous-puberulous on the upper 1/4 inside, slightly accrescent; petals linear-lanceolate, acute at the apex, up to 11 cm long and 1.1 cm wide, brownish and minutely tufted-tomentellous outside, greenish-brown to whitish and densely striate-arachnoid inside; stamens about 250-420, basally pink, apically white, the staminal tube very short, 3 -5 mm long, with 5 vertical, scatteringlv pilose zones to more or less densely villous, divided into 5 distinct phalanges up to 9 cm long, the anthers hippocrepiform; ovary oblong, 5-angular, about 5 mm long and 2.5 mm m diam., glabrous, the style filiform! angular at the base, up to 10 cm long, red and glabrous, the stigma minutely 5-lobulate. Capsule fusiform, obtuse and slightly emarginate on both ends (when young, however, conspicuously caudate-acuminate at the apex), 7-8 cm long and 2-2.5 cm in diam., greenish but tawny when dry, smooth and more or less shining (immature), glabrous; seeds subglobose, about 4 mm in diam., brownish, the kapok tawny.

Distribution and Ecology - VENEZUELA. Bolivar:locally frequent, Piedra Mapollos, 10 km above El Carmen on Rio Parguaza (about 60 km from river mouth), alt 110-250 m, Wurdack & Monachino 41084 (MO, NY) ; Amazonas: frequent on crystalline laja, 1-1.5 km E of Hotel Amazonas, Puerto Ayacucho, alt 150 m, Maguire, Wurdack & Bunting 37708 (MO, NY).

Discussion:

This very interesting species (see also Croizat, Adansonia 4: 449. 1964) was known previously only from two collections from Bolivar, Venezuela: Croizat 39 (holotype F) and Velez 2525 (YEN). Two additional collections, one from Bolivar and one from Amazonas, Venezuela, permit me to give a more complete description of this taxon.