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(Last Modified On 9/4/2013)
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(Last Modified On 9/4/2013)
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Species
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Exostema mexicanum A. Gray
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PlaceOfPublication
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Proc. Am. Acad. Arts 5: 180. 1861.
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Note
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TYPE: Mexico, Ervendberg 125 (not seen).
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Description
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Trees to 9.5 m tall or shrubs, the twigs terete, smooth, drying gray or gray green, lenticellate, glabrous, the nodes 5-7 cm apart. Leaves oblong, obovate oblong or widely ovate, 5.5-17 cm long, 2-9.5 cm wide, deltoid to obtuse at the apex, often tapering into a vague acumen or somewhat attenuate acuminate, the basal acumen to 1.5 cm long, ultimately obtuse, widely cuneate or rounded, occasionally truncate, the costa plane or immersed above, prominulous beneath, the lateral veins about 10, the intervenal areas spreading reticulate, chartaceous, glabrous above and beneath, often minutely pubescent in the axils beneath; pet- ioles to 1.5 cm long, strict or curved, stout; stipules (fide Standley) 2.5-4 mm long, triangular, acuminate or long cuspidate. Inflorescences terminal and/or ax- illary, glabrous, thrysoid cymose, shorter than or occasionally as long as the uppermost leaves, the peduncles absent and then with 3 branches arising from the tip of the twig, or distinctly pedunculate, the peduncles 2-5 cm long, the branches few, well spaced, divergent, the first and second pairs opposite, the cymules terminal, disposed in a fan or brush-like pattern. Flowers white, short pedicellate; hypanthium oblong, ca. 2 mm long, glabrous or puberulent, the ca- lycine cup scarcely measurable with patches of minute reddish glands within, the
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Habit
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Trees
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Description
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calycine teeth 5-6, subequal, widely or narrowly subulate; corolla with tube curved, narrow cylindrical, 7-10 mm long, ca. 0.5 mm wide, petaloid, puberulent outside, glabrous within, the lobes 6, linear oblong, ca. 12 mm long, ca. 1.5 mm wide, obtuse, glabrous within; stamens 6, the anthers linear oblong, 3-4 mm long, basifixed, the filaments linear, to 16 mm long, free from corolla tube, attached basally in a ring, ca. 1 mm long; style cylindrical, linear, to 24 mm long, thicker above the middle, the stigmas clavate, ca. 0.6 mm long. Fruits septicidally bival- vate, each valve splitting medially, fusiform oblong or obovate oblong, to 12 mm long, 3-4 mm wide before splitting, lignose, glabrous, white punctate lenticellate; seeds subfusiform, 7-9 mm long, 2-3 times longer than wide, membranous, the body plane, oblong rotund, ca. 2 mm in diam., the wing at 1 end subtriangular or oblong, obtuse, bifid at other end, the processes divergent, one oblong and obtuse, the other shorter, subtriangular and acute.
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Distribution
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known from Mexico, Guatemala, Belize, Honduras, El Sal- vador, and Panama.
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Specimen
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CANAL ZONE: Madden Dam, Dwyer & Elias 7502, 7508 (both MO), 7510 (MO, NY); Dwyer 8391 (MO), 9164 (MO, NY); Divyer & Nee 11979 (MO). PANAMA: Vera Cruz, Bristan P-19 (MO). Between Rio Bayano dam and Caniitas, D'Arcy 9385 (MO).
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