16. Sedum clavatum R. T. Clausen.

Sedum clavatum, sp. nov., affine et simile S. lucidum, sed caulibus et foliis glaucis; sepalis longioribus, 5-8 mm. longis, et clavatis; et antheris rubris; aliter foliis crassis, clavatis, elliptico-oblanceolatis vel obovatis, brevicalcaratis, obtusis, et licinis; caulibus floriferentibus axillaribus; et floribus albis cum petalis ellipticis. Typus in Herbario Wiegand, Universitatis Cornellianae, ex cremno in Barranca de Tiscalatengo inter septentriones et orientem spectante de Villa Guerrero, Mexico, 1 km. secundo flumine de ponte viae de Tenancingo ad Villa Guerrero, cultus in Ithaca, N.Y., 1956, Martius 24, Robert T. Clausen TMV-T-Tis 1, est. Species dedicata ad Edward J. Alexander et amicum illium, Charles L. Gilly.

Diagnosis (based on 5 plants from the gorge of the Tiscalatengo River in the vicinity of Villa Guerrero, Mexico, and cultivated at Ithaca, N.Y.): subshrubs with glaucous, thick, clavate, upcurved, short-spurred, elliptic-oblanceolate or obovate leaves; flower-bearing stems axillary; sepals clavate, 5-8 mm. long; petals elliptical and white; anthers red. For a fuller description, see Clausen (1959: 102-107). Distribution: gorge of the Tiscalatengo River in the vicinity of Villa Guerrero, State of Mexico, Mexico. Type locality: cliff of andesite, alt. 2,180 m., exposed to southwest, 30 m. above Tiscalatengo River, in gorge about 4 km. west-southwest of Tenancingo and about 1 km. downstream from bridge of highway between Tenancingo and Villa Guerrero. First record in cultivation: 1947, at the New York Botanical Garden. Flowers in greenhouse at Ithaca, N.Y., from March to July. Other names: Sedum of the Tiscalatengo Gorge.

© Sedum of North America, 1975