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(Last Modified On 5/8/2013)
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(Last Modified On 5/8/2013)
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Genus
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Parathesis (A. DC.) Hook. f.
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PlaceOfPublication
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Benth. & Hook. f., Gen. P1. 2: 645. 1876.
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Synonym
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Ardisia sect. Parathesis A. DC., Prod. 8: 120. 1844.
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Description
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Trees or shrubs, the young branchlets commonly ferruginous-tomentose with stellate or dendroid trichomes, often glabrescent. Leaves petiolate, usually pubescent on the lower surface, the trichomes stellate or dendroid, often appressed and bizonal, the margins entire, crenulate, or dentate. Inflorescences paniculate, axillary or terminal. Flowers bisexual, usually (4-) 5 (-6) -merous, mostly pink or white, umbellate, corymbose, or subcorymbose-racemose; sepals small, open in the bud, connate basally, commonly tomentulose and papillose; corolla rotate, usually tomentulose outside, papillose-tomentose inside at least apically and along the edges, the petals connate basally, valvate, narrow, acutish; stamens (4-)5(-6), inserted near the base of the corolla tube, the filaments well devel- oped, slender to stout, the anthers sagittate, lanceolate to ovate, acute or mucronate or obtuse apically, dorsally punctate or epunctate, dehiscent by introrse slits or apical pores, usually dorsifixed above the base, erect or ver- satile; ovary ovoid or subglobose, the ovules few to numerous, usually 1- seriate, sometimes partially 2-seriate, or rarely pluriseriate on the placenta, enclosed or exposed apically, the style long and slender, the stigma punctiform. Fruit 1-seeded, the endocarp crustaceous, the embryo cylindric, transverse.
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Distribution
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A genus of about 75 species in tropical America, chiefly in the mountainous regions of southern Mexico and Central America. Eight species are recorded for Panama.
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Reference
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Lundell, C. L. The Genus Parathesis of the Myrsinaceae. Contr. Texas Res. Found., Bot. Stud. 5: xiv + 206. 35 pl. 71 fig. 1966.
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Key
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a. Inflorescences terminal. b. Anthers versatile at anthesis. c. Leaves sub-bullate, to 22.5 cm long and 10 cm wide; branchlets conspicuously red-tomentose, the trichomes dendroid, persistent ...... 1. P. amplifolia cc. Leaves not sub-bullate, to 11.5 cm long and 4.2 cm wide; branchlets minutely puberulent and papillose at first, glabrescent ....... 2. P. panamensis bb.Anthers erect at anthesis. d. Sepals ovate, 1 mm long or less; inflorescences to 7 cm long; leaves to 11 cm long -------------- 3. P. microcalyx dd. Sepals narrowly triangular, to 1.8 mm long; inflorescences usually over 15 cm long; leaves to 17 cm long. e. Branchlets persistently rufous-pubescent; leaves elliptic or obovate-elliptic, crenulate, with appressed stellate bizonal pubescence beneath; ovary gla- brous -------------------------- 4. P. fusca ee. Branchlets essentially glabrous (in fruit); leaves lanceolate, entire, glabrous; ovary with scattered short trichomes apically and at the base of the style (in fruit) ----------------------- P. tenuifolia aa. Inflorescences axillary. f. Anthers slender, linear-lanceolate, concolorous or with 1-3 minute black glands dorsally; leaves mostly lanceolate, tapering to the acuminate apex - 6. P. seibertii ff. Anthers thick, ovate-lanceolate or lanceolate-elliptic, usually black-punctate dor- sally; leaves mostly oblanceolate or obovate, abruptly or subabruptly acuminate. g. Stamens 2.2-2.5 mm long, filaments equaling the anthers; leaves reticulate- veined, with a distinct submarginal vein ...... 7. P. montana gg. Stamens 3-4 mm long, filaments shorter than the anthers; leaves not reticulate- veined, without a distinct submarginal vein ...... 8. P. glabra
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