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(Last Modified On 3/28/2013)
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(Last Modified On 3/28/2013)
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Genus
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Tetrathylacium Poeppig in Poeppig & Endl.
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PlaceOfPublication
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Nov. Gen Sp. PI. 3: pl. 240, 184 14, p. 34, 1843.
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Synonym
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Edmonstonia Seemann, Bot. Voy. Herald pl. 18, 18524, p. 98, 18534.
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Description
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Trees, infrequently shrubs, unarmed. Leaves alternate, short-petiolate, the stipules large, foliaceous, caducous, the blade rather large, rounded to cordate at the base, the margins entire to remotely repand-serrate, epunctate, penninerved. Inflorescences axillary, paniculate-spicate, the flowers sessile and densely crowded or not along the secondary rachises (spikes), elongated in fruit. Flowers small, y, each one subtended by a bract and 2 bracteoles, these small and closely appressed along the rachis; calyx urceolate, thickened, 4-gibbous or 4(-5)-angulate (com- pressed by the crowding of the flowers along-the rAchis), 4-lobed, persistent, the lobes small, rounded, membranous, biseriately imbricate; petals none; stamens 4, inserted within the calyx tube, the filaments alternate with the calyx lobes, the anthers introrse, longitudinally dehiscent, exserted or not; ovary sessile, 1-locular, with 4 parietal, many-ovulate placentas; style very short, the stigma obscurely 4- lobed. Fruits baccate, coriaceous, the seeds numerous, exarillate, each seed sur- rounded by a thin membrane (small compartment, of placentary origin?), the testa foveolate-alveolate.
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Habit
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Trees
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Distribution
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A genus of three species, ranging from Costa Rica to Peru; two species reported from Panama.
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Key
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a. Flowers very densely crowded along the secondary rachises (spikes) of the inflorescences, calyx 4(-5) angled by the crowding of the flowers ............ 1. T. johansenji aa. Flowers not crowded along the secondary rachises (spikes) of the inflorescences; calyx 4-gibbous ................. 2. T. macrophyllum
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