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(Last Modified On 8/13/2013)
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(Last Modified On 8/13/2013)
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Species
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Styrax conterminus Donnell Smith
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PlaceOfPublication
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Bot. Gaz. (Crawfordsville) 18: 5. 1893.
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Note
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TYPE: Guatemala, Heyde & Lux 2915 (MO, isotype).
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Description
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Tree 5(-14) m tall, the twigs sharply angled, somewhat rufous with scutellate, peltate scales. Leaves oblong or elliptical, 5-17 cm long, 3-5 cm wide, sub- coriaceous, apically acuminate, basally obtuse, the veins 6-9 on each side, arcuate, impressed above, elevated and somewhat rufous beneath, the minor venation reticulate, sometimes indistinct, the minor venation minutely elevated on each side, appearing glabrous above but with dispersed peltate scutellate scales 0.3 mm across, beneath fine appressed tomentose with white scutellate scales and punctate with emergent, darker scales; petiole 8-20 mm long, slender, lepidote. Inflorescences short racemes to ca. 5 cm long in the axils of the upper leaves; peduncle angled, slender; pedicels nodding, angled, 7-10 mm long; bracts scale- like, ca. 2 mm long, caducous. Flowers 10-14 mm long, calyx finely and evenly lepidote, subtruncate, cupular, 3-4 mm long and about as wide; corolla valvate, divided to the calyx rim into linear segments, dorsally fine tomentose, 7-9 mm long; stamens 10, the filaments connate for the basal 2/3, adnate to the corolla tube for the basal 1/2, appressed pubescent dorsally, with a prominent incon- spicuously tomentose boss on the ventral side just above the point of corolla insertion, glabrous and narrower above, the anthers linear, 2-thecate, exserted from the corolla tube but shorter than the corolla lobes, the connective covering the back of the anther; ovary apically subtruncate, beaked, scutellate-lepidote overall, the stigma linear with 3 minute stigmatic lobes, slightly exceeding the anthers. Fruit not seen (Gonsoulin), 12-15 mm long, 7-8 mm wide, silvery lepidote; seed usually 1.
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Habit
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Tree
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Note
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This species is distinguished from the other Panamanian species of Styrax by its indumentum which is visible under a hand lens. The arms of the stellae are fused for most of their length into scutellate scales, and the scale is peltate or subsessile. In some areas such as leaf undersides, the scales form a dense, fine, closed tomentum. Styrax conterminus is perhaps conspecific with S. ovatus (R. & P.) A. DC. from Peru, but it was treated as separate by both Perkins and Gonsoulin. The photograph of the type collection from Berlin reveals a plant with somewhat wider leaves and perhaps more ample inflorescences which may token a different species. No collections of S. ovatus were seen from Peru. Styrax conterminus is the only species of Styrax in Central America with a scutellate indumentum. Three other such species occur in the Antilles and more than one other may occur in South America. The species is known in Panama only by one collection from western Chiriqui.
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Specimen
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CHIRIQUI: Cerro Colorado along mining road 31.6 km beyond Rio San Felix, 1690 m, Croat 37190 (MO).
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