. The natural history of plants. Botany. NATURAL HI8T0BY OF PLANTS. Braehyotim Benthaminnvm. formed genus, Tibouchina, comprises about two hundred species which grow from the south of Mexico to the south-east of Brazil. From the above three subgenera, with some hesitation, we sepa- rate Pterogastra, dichotomous herbs of tropical America, having 4, 5-merous flowers with dimorphous anthers; the connective of the alternipetalous is more prolonged below the anther than that of the others, and may there bear a small appendage wanting in some species. The five angles of the receptacle and the corres
. The natural history of plants. Botany. NATURAL HI8T0BY OF PLANTS. Braehyotim Benthaminnvm. formed genus, Tibouchina, comprises about two hundred species which grow from the south of Mexico to the south-east of Brazil. From the above three subgenera, with some hesitation, we sepa- rate Pterogastra, dichotomous herbs of tropical America, having 4, 5-merous flowers with dimorphous anthers; the connective of the alternipetalous is more prolonged below the anther than that of the others, and may there bear a small appendage wanting in some species. The five angles of the receptacle and the corresponding rib of the sepals are dilated to a verticle dentelate wing, which per- sists to the fruit. Aciotis, small herbs of tropical America and the Antilles, has small insignificant flowers, with very slightly-developed calyx. The eight stamens, at first 'incurved, have a short anther, with apical pore, basilar connective, articulated to the summit of the filament, of which it is continuous, with long obconical and truncated style. The ovary is bilocular, and the fruit membranous and indehiscent. Not materially differing in organization from the preceding types, Brachyotum (fig. 11) is immediately distinguished by its 4, 5-merous drooping flowers, the petals of which unite in a false campanulate corolla ordinarily surrounded by imbricate bracts forming a calycule. The stamens have incurved filaments and the two cells of the anthers are prolonged downwards in two short and obtuse appendages. Brachyo- tum comprises shrubs of Columbia, Peru, and Bolivia. The American plants named Microlicia, by Don, have given their name to a tribe {MicroliciecB), and are distinguished from all the TibouchinecB by the characters of the seed, which is ovoid, oblong, straight or curved, whilst in the Tibouchinece it is more generally cochleate. To these characters we can accord no more than quite a secondary importance. The true Microlicias have a tubular recep- tacle, five sepals of nearly the same
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
