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Project Name Data (Last Modified On 7/19/2013)

Flora Data (Last Modified On 7/19/2013)
Common sauce willow
Specimen CHIRIQUI: In village of El Volca'n, 4,000 ft, Tyson 7379 (MO).
Species Salix humboldtiana Willd.
PlaceOfPublication Sp. PI., ed. 4. 657. 1805.
Note TYPE: Peru, Humboldt (B-Willd. 18108, not seen, microfiche MO).
Synonym Salix chilensis sensu auct., an Molina, Saggio Storia Nat. Chili 169. 1782.
Description Shrubs or trees to 15 m tall; branches slender, flexuous, puberulent with weak spreading hairs, drying with reddish bark, the youngest growth drying yellowish. Leaves linear-lanceolate, 5-6 cm long, 4-4 mm wide, apically acute, basally obtuse, the margins serrate with low callose-glandular teeth, glabrous beneath, the costa pilose to puberulent and glabrescent above, the costa prominently elevated beneath, plane above, the surface finely rugose above, the minor venation not evident, beneath the minor venation slightly elevated, differing in texture from above, the lateral veins ill-spaced, more or less arcuate, forming a well- defined submarginal vein ca. 0.5 mm from the margin; petiole slender, 3-5 mm long, deeply canaliculate above, pubescent; stipules subfoliaceous, dentately 3-4 mm long, deciduous. Inflorescences lax racemes (aments, catkins) terminal on short lateral shoots, 3-10 cm long, the flowers congested at anthesis, slightly more distant in fruit, the rachis angled, short-pilose near the base with several foliose basal bracts with reduced stipules; bracteoles 1-2 mm long, ovate, densely ciliate; pedicels obsolete. Flowers (female) with the gland deeply 2-lobed, ca. 0.3 mm long, slightly reddish; ovary narrowly ellipsoidal, stipitate, the stipe 0.5-1.0 mm long, in fruit becoming 1 mm long and resembling pedicels, the stigmas 4 in 2 pairs, digitate. Fruit ovoid to ellipsoidal, ca. 6 mm long, drying brownish; seeds ca. 1 mm long, compressed trapezoidal, long pubescent (comose) with white hairs. Male flowers were not seen.
Habit Shrubs or trees
Note This species is distinct in the Panamanian flora because of its narrow, serrate leaves and its racemes of small fruits filled with silky-plumose seeds. In Panama it has been collected only in the Chiriqui Mountains.
Distribution ranges widely in South America and through Central America into Mexico.
Note Becoming a substantial tree, it is also widely cultivated in warm parts of the New World. This species belongs (Schneider, 1919) to sect. Nigrae of the Pleiandrae group, which includes sects. Nigrae, Triandrae, and Pentandrae subsects. Lucidae and Bonplandianae. This group is entirely New World in occurrence, ranging from Ontario to South America. In this group male flowers have 3-15 stamens whereas other American species in the genus have 2 or only 1. A number of infraspecific taxa have been recognized under S. humboldtiana. Although the name S. chilensis is earlier than the name used here, Schneider (1917) dismissed it, judging that it probably does not refer to a member of this genus.
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