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(Last Modified On 1/17/2013)
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(Last Modified On 1/17/2013)
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Species
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ALNUS FERRUGINEA HBK.
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PlaceOfPublication
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Nov. Gen. & Sp. 2:17. 1817.
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Synonym
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Alnus acuminata var. ferruginea (HBK) Regel, in Mem. Soc. Nat. Moscow 8:148. 1861. Alnus jorullensis var. y ferruginea (HBK) 0. Ktze. Rev. Gen. 32:295. 1898.
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Description
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Trees to 25 m. tall, the branches terete, more or less glabrous, the buds sparsely ferrugineous-velutinous. Leaves ovate to ovate-lanceolate, 5-17 cm. long, 3-7 cm. broad, acute to acuminate at the apex, obtuse to rounded at the base, margin serrate, peltate glandular above when young, peltate glandular and ferrugineous- velutinous below; petiole 0.6-1.7 cm. long, densely velutinous to almost glabrous. Staminate catkin (immature) to 2.5 cm. long, about 4 mm. in diameter, shortly stalked to subsessile. Staminate flowers small; tepals 4, more or less oblong, incised, to 1.25 mm. long, 0.5 mm. broad; stamens 4, opposite the tepals, the filaments short, adnate at their bases to the tepals, the anthers oblong, to 1 mm. long, 0.5 mm. broad. Pistillate catkin at maturity an ovoid cone, 1-2 cm. long, 0.7-1.2 cm. in diameter. Pistillate flowers small; pistil less than 0.5 mm. long,' the styles 2, spreading; fruit samaroid, obcordate, 2.5-3.5 mm. long, 1.5-2.5 mm. broad.
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Habit
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Trees
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Note
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A common tree in the Chiriqui Volcano region where it forms almost pure stands or sometimes intermixes with oaks. Occupies about 20 percent of the forest stand in the 8,000-10,000 ft. zone.
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Elevation
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8,000-10,000 ft.
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Note
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The status of this group is not definite. It has been assigned specific rank and also varietal rank in two species. The most practical position is to retain it as a species until further evidence indicates a change of status to be necessary.
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Specimen
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CHIRIQUI: Finca Lerida to Pefia Blanca, alt. 1750-2000 m., Woodson d Schery 317; valley of the upper Rio Chiriqui Viejo, White d& White 57, P. White 3I9; Volcain de Chiriqui, Davidson 997; Llano del Volcan, alt. 1500-1600 m., Allen d Fairchild 3468; Bajo Chorro, Boquete District, Davidson i73; summit and SW face of Cerro Copete, alt., 9000 ft., Allen 4895.
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