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(Last Modified On 3/13/2013)
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(Last Modified On 3/13/2013)
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Genus
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SAURAUIA Willd.
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PlaceOfPublication
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Ges. Naturf. Freunde Neue Berlin Schr. 3: 407. 1801.
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Synonym
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Palaua Ruiz & Pavon, Fl. Peruv. Chil. Prodr. 100. 1794, non Cav. (1785). Apatelia DC., Mem. Soc. Phys. Hist. Nat. Geneve 1: 426. 1822. Marumia Reinw. ex Blume, Cat. Gew. Buitenz. 79. 1823, nom. nud. Reinwardtia Blume ex Nees, Syll. P1. Nov. (Ratisb.) 1: 96. 1824, non Dumort. (1722), Korth (1841) nec Spreng. (1825). Tonshia Buch.-Ham. ex D. Don, Prodr. Fl. Nep. 225. 1825. Blumia Spreng. in L., Syst. Veg. ed. 16, 3: 126. 1826, non Nees (1823). Obelanthera Turcz., Bull. Soc. Nat. Moscou 20(1): 148. 1847. Draytonia A. Gray, Bot., Phanerog. in U. S. Expl. Exped. (1838-42) 15: 206. 1854. Trematanthera F. Muell., Vict. Nat. 3: 71. 1886.
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Description
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Trees and shrubs, pubescent. Leaves simple, spiral, petiolate. Inflorescences axillary, basically thyrisiform. Flowers regular, basically 5-merous (S. laevigata basically 4-merous), pedicellate; sepals 3-6, often 5, persistent, the outer usually somewhat smaller and more densely pubescent than the inner, the aestivation quincuncial; petals 3-6, usually 5, white to pinkish, fused at the base, falling as a unit with the stamens; stamens indefinite, the filament adnate to the base of the corolla, filiform, pubescent at the base, the anthers bifurcate, versatile, extrorse, basally dehiscent by rimiform pores; ovary globose, 3- to 6-, frequently 5-locular and sulcate, the ovules indefinite, anatropous, the placentation axile, the styles as many as the locules, free, filiform, obsolete to exceeding the stamens, the stigmas simple to capitate. Fruit baccate, the seeds many, small, areolate, embedded in a mucilaginous pulp, the embryo straight, 1/3-22 as long as the seed; endosperm mealy.
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Habit
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Trees shrubs
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Distribution
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Numerous species in the tropics of Asia and America.
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Note
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Saurauia has been treated as a member of the Theaceae, Actinidiaceae, Saurauiaceae and Dilleniaceae. It is my opinion that the genus is most closely allied with Clethraceae; however, as a matter of expediency, following the Englerian classification, it is included in the Dilleniaceae.
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Key
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a. Plants often copiously pubescent; leaves with tertiary veins elevated, more prominent than the lesser reticulation; flowers usually 5-merous, more than 12 mm broad, the sepals densely pubescent. b. Leaves smooth above; ovary and fruit densely pubescent - 1. S. VERAGUASENSIS bb. Leaves scabridulous above; ovary and fruit glabrous - - 2. S. RUBIFORMIS aa. Plants sparingly pubescent; leaves with tertiary veins immersed, scarcely more prominent than the lesser reticulation; flowers 3- to 5-merous, sometimes less than 10 mm broad; ovary and fruit glabrous. c. Flowers 4-, rarely 5- or 3-merous, less than 10 mm broad, the sepals spar- ingly pubescent -- 3. S. LAEVIGATA cc. Flowers 5-merous, more than 12 mm broad, the sepals densely pubescent -----------------------4. S. SEIBERTII
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