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(Last Modified On 9/18/2013)
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(Last Modified On 9/18/2013)
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Genus
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Rustia Klotzsch
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PlaceOfPublication
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Arzn. Gew. 14: p1. 14. 1846.
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Note
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LECTOTYPE: R. formosa (Cham. & Schlecht.) Kl. (Exostem(m)a formosum Cham. & Schlecht.).
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Description
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Trees or shrubs, the branchlets glabrous. Leaves glandular punctate; stipules large, deciduous. Inflorescences terminal, paniculate. Flowers pedicellate, the pedicels bracteolate; hypanthium campanulate or turbinate, the calycine cup with 5 lobes or teeth; corolla funnelform or campanulate, the tube glabrous to hairy within, the lobes 5, valvate; stamens 5, the anthers basifixed, opening by a ter- minal slit or pore, the filaments attached at the throat; ovarian disc terete or sulcate, the style dilated medially, clavate at the apex or the 2 stigmatic lobes conspicuous, the ovary 2-celled, the ovules numerous, attached vertically to the septum. Fruits capsular, coriaceous, oblong ovoid, the 2 valves separating loc- ulicidally; seeds numerous, minute, horizontal, the testa membranous.
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Habit
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Trees or shrubs
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Note
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a genus of about 15 species,
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Distribution
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ranges from Mexico, Central America to South America. It also occurs in the West Indies.
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Note
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From a floral viewpoint it is the easiest genus to recognize among the Panamanian Rubiaceae, as the anthers open by terminal pores. The pellucid-punctate leaves are also unique.
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Reference
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Simpson, D. 1976. Studies in Neotropical Rubiaceae. 1. Rustia. Phytologia 33: 4.
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Key
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a. Largest leaves not exceeding 9 cm in width; corolla purple or red; fruits ca. 10 mm long ...... 1 . R. occidentalis aa. Largest leaves 20-19 cm wide; corolla white; fruits ca. 5 mm long ...... 2. R. panamrensis
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