EOSE MEXICAN AND CENTRAL AMERICAN PLANTS. 297 



FIFTEEN NEW AND ONE RESTORED SPECIES OF SEDUM. 



Sedum (P) clavifolium'Rose, sp. nov. 



Perennial, branching at base and forming dense mats; basal and lower stem leaves 

 1 to 3 cm. long, thickened but flattened above, tapering below into long, slender, 

 nearly terete petioles, obtuse; stem 1 to 3 cm. high (in cultivated specimens 8 cm.); 

 stem leaves similar to the basal but smaller, alternate; inflorescence a few-flowered 

 cyme; pedicels 5 to 8 mm. long; sepals 5, distinct, green, unequal, spreading, thick 

 and club-shaped, rounded at the apex, all longer than the petals; petals widely spread- 

 ing, or even reflexed between the sepals, somewhat cup-shaped beyond the sepals, 

 obtuse, pale greenish yellow, about 3 mm. long; stamens 10, the five opposite the 

 petals borne upon them, the other five distinct; scales 5, large, deep red, erect, more 

 or less lobed and toothed at the apex; carpels 5, ovate, erect even in fruit, tipped by 

 very short styles; seeds oblong, several in each cell. 



Type U. S. National Herbarium no. 399592, derived from material collected by 

 Dr. C. A. Purpus on rock above timber line, Ixtaccihuatl, State of Mexico, Mexico, 

 in November, 1905 (no. 1681), and flowered in Washington in June, 190(i. 



This little plant is very tenacious of life, for the herbarium specimens collected in 

 November, 1905, were sending out new leaves June 14, 1906. 



This species is very unlike a true Sedum in its erect carpels, very large petaloid 

 scales, reflexed petals, distinct sepals, etc. 



In its flower structure it comes close to Sedum longipes Hose. 



Sedum compactum Rose, sp. nov. Plate 53. 



Plants creeping, forming a dense, moss-like carpet; sterile branches small, bearing a 

 compact rosette of leaves; leaves closely imbricated, narrowly oblong, 3 to 5 mm. long, 

 obtuse, flattened but fleshy, glabrous; flowering branches ascending or erect, 3 or 4 

 cm. high, their leaves alternate, similar to those on sterile branches; flowers solitary, 

 terminal, sessile; sepals similar to the leaves and about half the length of the petals; 

 petals white, broadly ovate, 4 mm. long, cup-shaped within. 



Type U. S. National Herbarium no. 574880, collected by C. A. Purpus on rocks, 

 Cerro de Sentile, Oaxaca, Mexico, altitude 2,100 to 2,400 meters, 1907, and flowered 

 in Washington, May and August, 1909 (no. 424). 



This species much resembles S. humifusuvi Pose in habit and foliage, but it is not 

 at all pubescent and the flowers are white, not yellow. 



Sedum delicatum Rose, sp. nov. 



Stems from small fleshy, fusiform tubers, 1 to 2 cm., or in cultivated specimens as 

 much as 4 cm., high, usually simple below; leaves club-shaped, nearly terete in 

 section, obtuse, alternate; inflorescence a few-flowered (2 to 5-flowered) cyme; ped- 

 icels slender, sometimes 15 mm. long; sepals 4 or 5, very unequal, similar to the 

 leaves, the longer ones much exceeding the petals; petals white, 2 mm. long, obtuse, 

 ascending; stamens 8 or 10; anthers purplish; carpels 5, widely spreading in age. 



Type U. S. National Herbarium no. 474951, collected by Dr. C. A. Purpus on rocks 

 near and above timber line on Ixtaccihuatl, State of Mexico, Mexico, 1905, and 

 flowered in Washington in June, 1906. 



This is a very peculiar species, perhaps nearest S. minimum, but with differently 

 shaped tubers, differently colored flowers, etc. 



Sedum farinosum Rose, sp. nov. Plate 54. 



Perennials, at first forming dense, elongated rosettes; flowering stems weak, ascend- 

 ing or spreading, about 10 cm. long, glabrous, whitish by a bloom especially noticeable 

 in dried specimens; leaves flat but thickish, translucent, spatulate, broadest just 

 below the rounded tip, 3 to 3.5 cm. long, glabrous; inflorescence a broad open cyme; 

 pedicels 2 to 3 mm. long; sepals green, 2 to 3 mm. long, oblong, obtuse, distinct to or 

 nearly to the base; petals white, spreading, lanceolate, 6 to 7 mm. long; stamens 10; 

 carpels widely spreading, tipped by the slender styles. 



