Siparuna vasqueziana S.S.Renner & Hausner
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Authority
Renner, Susanne S. & Hausner, Gerlinde. 2005. Siparunaceae. Fl. Neotrop. Monogr. 95: 1--247 pp. (Published by NYBG Press)
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Family
Monimiaceae
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Scientific Name
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Type
Type: Peru. Amazonas: Distr. El Cenepa, Comunidad de Tutino, Pumpuentsa, primary forest, 340 m, 28 Jun 1997 (male), Vásquez, Peña, Chávez & Quiaco 24278 (holotype, AMAZ n.v.; isotypes, F, HUT n.v., MO, MOL n.v., NY, USM n.v., W).
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Description
Species Description - Dioecious tree let, 4-5 m tall; branchlets distinctly quadrangular, with four raised longitudinal ridges, flattened at the nodes, with short, simple or few-branched hairs. Leaves opposite; petioles 2.5-9.5 cm long; lamina drying greenish brown, papery and brittle, broadly obovate, 26-37 X 17-19 cm, the base obtuse, rounded, or truncate, the apex short-acuminate, both surfaces with scarce short simple (cf. Fig. 4A), bi or trifid hairs, with 16-18 pairs of secondary veins, these flat above, distinctly raised below, the margin denticulate, the teeth most pronounced near the lamina base. Cymes up to 7.5 cm long in the male, 3- or 4-branched, often on leafless nodes, with 10-12 flowers, pubescent like the branchlets. Fresh flowers yellowish; male floral cup subglobose, 1.3-2.1 mm in diam., 1.1-1.6 mm high, with short (0.05-0.2 mm long) simple to three-branched whitish hairs, some of these also on the tepal surfaces and margins, the 4 tepals spatulate to oblong, 3-10 X 1.5-3.5 mm, the floral roof moderately raised, glabrous; stamens 2224; female floral cup 3.3-3.7 mm in diam., 3-3.5 mm high, the floral roof tightly surrounding the styles; styles 15-20. Fruiting receptacle immature globose and smooth, mature fruits unknown.
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Discussion
Siparuna vasqueziana is unique in the genus because of the size of its tepals (to 1 cm long and 3.5 mm wide). Among Ecuadorean and Peruvian species, it is further distinct by its combination of strongly quadrangular branchlets and large smooth (not bullate) leaves. A similar indumentum and quadrangular branches are seen in S. macrotepala, but that species has smaller leaves, much shorter tepals, fewer secondary veins, and usually 6 stamens rather than 2224.
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Common Names
tsuna jopimagbáu, tsuna jopibagbáu, tsuna hapimagbau
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Distribution
Siparuna vasqueziana occurs in primary forests at low elevations in Amazonian Peru.
Amazonas Peru South America| Loreto Peru South America|