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(Last Modified On 8/19/2013)
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(Last Modified On 8/19/2013)
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Species
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Arcytophyllum lavarum Schum.
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PlaceOfPublication
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Engl. & Prantl, Nat. Pflanzenfam. IV (4): 28. 1891.
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Note
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TYPE: Panama', Maxon 5349 (US, holotype).
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Synonym
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Mallostoma lavarum (Schum.) Donnell. Smith, Enum. P1. Guatem. 5: 36. 1899.
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Description
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Subshrubs, ericoid in habit, profusely branched, the branches lax, glabrous, drying silver tan or purple black, ridged, the nodes well spaced or crowded, swollen (bases of persistent stipules). Leaves oblong, 0.5-0.8 cm long, 0.2-0.4 cm wide, obtuse at the apex, obtuse to truncate at the base, the costa and the lateral veins evanescent, carnose, ericoid, lustrous, scarcely bicolorous, marces- cent on drying; petioles to 1 mm long or absent; stipules connate, disposed as a short cup, to 0.25 cm long, the free portion deltoid, longer than the cup and often contiguous with the stipule above, the margin erose with a few ascending irregular subulate teeth. Inflorescences terminal, to 1.5 cm beyond the uppermost leaves, usually with 2 peduncles, to 0.3 cm long, each bearing a terminal cymule. Flowers with the hypanthium rotund, to 0.65 mm long, petaloid,-glabrous, the calycine cup very short, with patches of flabellately disposed minute oblong glands and squamellae intermixed within, the teeth 4, erect, oblong or ovate oblong, often obtuse, to 1.3 mm long, often with an upright gland at the junction of 2 lobes, glabrous, petaloid; corolla white, white tinged with purple, blue or lavender pink, the tube campanulate oblong, ca. 2.5 mm long, the lobes not cucullate, villosulose on the adaxial face; stamens 4, the anthers oblong, 0.8-1 mm long, dorsifixed, the filaments slender, attached above the middle of the tube, the style slender, ca. 4 mm long, slightly dilated apically, the stigmas 2, clavate when connate, ca. 0.4 mm long; ovary thin walled, the septum thin, the ovules several, arising on a distinct stipe attached almost at the base of the septum, the locule ample. Fruits short pedicellate, capsular, rotund or compressed rotund, to 1.5 mm in diam., truncate, the calycine lobes persistent, a thin annular ring marking their point of origin, the valves splitting from the apex.
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Habit
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Subshrubs
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Distribution
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Arcytophyllum lavarum is restricted to high mountainous regions of Costa Rica and Chiriqui.
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Note
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A photo of A. lavarum at MO is labeled as a Pittier collection (unnumbered) from Costa Rica, deposited in Berlin, but this is not the type.
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Specimen
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CHIRIQUi: Volcdn de Chiriqui, Davidson 1293 (F, MO). Between Baru and Respinga, 3000 m, D'Arcy 10095 (MO). Chiriqui Volcano, 3374 m, Maxon 5349 (US). W side of Volcdn Bar6, ca. 3000 m, Mori & Bolten 7342 (MO). Trail to summit, Volcdn de Chiriqui 2500-3400 m, Mori & Kallunki 5748 (MO). Volcdn de Chiriqui, W slope, Wilbur et al. 11033 (F, MO). Potrero Muleto to summit of Volcdn de Chiriqui, Woodson & Schery 437 (MO). Loma Larga to summit of Volcdn de Chiriqui, Woodson et al. 1087 (F, MO).
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