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(Last Modified On 8/20/2013)
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(Last Modified On 8/20/2013)
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Species
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Cephaelis dressleri Dwyer
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Note
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TYPE: Panamai, Croat 16801 (MO, holotype).
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Description
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Subshrubs to 1.5 m tall, the stem lignose, rough, glabrous, the pith partly porous, sometimes rooting toward the apex. Leaves occasionally sessile, obovate oblong, 10-44 cm long, 6.5-22.0 cm wide, rounded or widely deltoid at the apex, short acuminate, the acumen triangular, to 1 cm long, to 1.5 cm wide at the base, cuneate toward the base finally slightly auriculate, the costa prominulous above or prominent, to 0.2 cm wide, prominent beneath, to 0.35 cm wide, dark brown and densely minutely puberulent, the lateral veins 21-25, slightly arcuate, forming an undulate marginal vein to 1 cm from the margin, the venules irregular pinnati- form and spreading, rigidly papyraceous to subcoriaceous, 1 of the 2 leaves drying slightly dark purple red beneath, minutely ferrugineous puberulent on the veins and venules; petioles, if present, to 4 cm long, stout; stipules (only 1 seen at the tip of the stem) ovate lanceolate, to 2.8 cm long, to 1 cm wide, subcoriaceous, glabrous, the veins somewhat prominulous, fanshaped, the awns narrowly ovate subulate, to 0.9 cm long, acute. Inflorescences terminal, 4.5-8.0 cm long, the peduncles 1-4 cm long, 0.3-0.5 cm wide, glabrous, bearing several short branch- es, the flowers disposed in a few subsessile oblong or subrotund heads, ca. 2 cm in diam., the cluster of heads compressed rotund, 3.5-5.5 cm wide; outermost bracts rotund or spathulate, to 12 mm long, brown, ultimately acute, concave, within with an irregular series of glands on each side of a median vein or with a few diffuse glands, ciliate; interior bracts several, narrower and more spathulate. Flowers subsessile; hypanthium scarcely measurable, the calycine cup to 2 mm long, petaloid, with ca. 10 unequal, narrowly oblong or widely subulate glands attached toward the base of the cup, the calycine lobes 5, subulate or triangular, to 3 mm long, slightly unequal, acute, densely ciliate; corolla white, the tube narrow cylindrical, 10-14 mm long, petaloid, glabrous or minutely puberulent outside, glabrous inside except white villose near or above the middle, the lobes 5, narrowly lanceolate, to 4.5 mm long, 1 mm wide, conspicuously cucullate near the middle, ultimately obtuse, carnose; stamens 5, the anthers narrowly ovate oblong or oblong, 2.5-3.0 mm long, sagittate at the base, the filaments slender, ca. 2.5 mm long, attached ca. 2 mm below the mouth; ovarian disc oblong rotund, ca. 1 mm long, the style slender, 6.5-9.0 mm long, the stigmas slender, ca. 2 mm long, densely villosulose. Fruits sessile, elliptic oblong, to 1.2 cm long, 0.4 cm wide, smooth, glabrous, each pyrene 4-sulcate, the ribs obtuse angular, the often persistent calycine cup and teeth to 3.5 mm long.
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Habit
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Subshrubs
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Distribution
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known from Panama and Colombia.
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Note
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It is named in honor of Dr. Robert Dressler, student of the flora of Panama and a specialist in the Orchidaceae. It is distinguished by its large sessile or subsessile leaves, round at the apex, with many lateral veins, and subauriculate at the base. The glands within the larger bracts and within the calycine cup are diagnostic.
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Specimen
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COL6N: Near Agua Clara at rain gauge, Santa Rita lumber road, Dressler 4677 (MO). DARIEN: Trail from Tacarcuna village, Rio Tacarcuna to Cerro Mali, 800-1300 m, Gentry 13598 (MO). SAN BLAS: Puerto Obaldia, Croat 16801 (MO). COLOMBIA: CHOCO: Rio Tigre W of Unguia, base of Serrania del Dari6n, 300 m, A. Gentry & L. Aguirre 15191 (MO).
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