300 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



yellow, widely spreading, or even bent backward, 7 mm. long, somewhat keeled on the 

 back, spoon-shaped above; stamens 10, yellow; carpels at first erect, yellow. 



Type U. S. National Herbarium no. 618380, collected by Dr. C. A. Purpus on hills 

 near San Luis, Oaxaca, Mexico, altitude 1,800 to 2,100 meters, in 1907 (no. 416) and 

 flowered in Washington, January, 1910. 



Resembling Sedum allantoides, but leaves much less glaucous and flowers yellow 

 instead of white. 



Sedum potosinum Rose, sp. nov. 



Stems low and weak, at first erect, but soon prostrate or at most ascending; leaves, 

 closely set, ascending, nearly terete, obtuse, 6 to 8 mm. long, pale green, glabrous, 

 slightly glaucous; inflorescence (usually?) an equilateral raceme; pedicels short, 1 

 to 2 mm. long; sepals linear, distinct nearly to the base, 3 mm. long; petals white or 

 slightly tinged with pink, widely spreading, 6 to 7 mm. long. 



Type U. S. National Herbarium no. 615397, collected by Dr. E. Palmer near San 

 Luis Potosf, Mexico, in 1905, and flowered in Washington in May, 1905, and June, 1908. 



Here also seems to belong Parry & Palmer's no. 236, which was referred to S. greggii 

 by Mr. Hemsley, 



Sedum rhodocarpum Rose, sp. nov. Plate 59. 



Perennial; 10 to 20 cm. high; stems flaccid, glabrous, somewhat 3-angled, bearing 

 3 to 6 whorls of leaves; leaves in 3's, flattened, rather thin, orbicular to spatulate, 

 2 to 4 cm. long, rounded at apex or sometimes refuse, narrowed at base into a short 

 petiole; inflorescence cymose, few-flowered or sometimes reduced to one flower; 

 pedicels 2 to 10 mm. long, often bearing a single bract near the middle; calyx green, 

 deeply 5-partcd; lobes often a little longer than the petals, obtuse, spreading, fleshy, 

 6 to 7 mm. long; petals distinct, broadly ovate, acute, reddish, in anthesis refiexed; 

 stamens red, 10, the five alternating with the petals distinct, the other five borne on 

 the base of the petals; carpels red, at first erect but in age widely spreading. 



Type U. S. National Herbarium no. 462503, collected" by C. G. Pringle on lime- 

 stone ledges of the Sierra Madre above Monterey, Mexico, altitude 1,800 meters, 

 December 21, 1906 (no. 10368), and flowered in Washington, November 19, 1907, and 

 in 1909. 



Sedum semiterea Rose, sp. nov. 



Perennial; sterile branches 3 to 4 cm. long, very leafy, the leaves appearing imbri- 

 cate, in cultivated specimens 10 cm. long, the leaves standing nearly at right angles 

 to the stem or somewhat drooping; leaves 1 to 2 cm. long, narrow, fleshy, nearly 

 semiterete in section, obtuse, strongly papillose, the papillae appearing more pro- 

 nounced in dry specimens; flowering stems ascending or erect, apparently very leafy, 

 10 to 20 cm. long; inflorescence a widely spreading cyme more or less papillose; 

 pedicels slender, 2 to 3 mm. long; calyx deeply cleft, the lobes ovate, 2 mm. long, 

 obtuse; petals 5, white, lanceolate, acuminate, 5 mm. long; anthers dark-colored; 

 carpels spreading, papillose-roughened, tipped by long, slender styles. 



Type U. S. National Herbarium no. 571200, collected by Dr. E. Palmer at San 

 Ram6n, Durango, Mexico, 3906 (no. 180). 



This species is nearest 5. alamosanum, but is stouter and has more flattened, papil- 

 lose leaves and white flowers. 



The species is in cultivation in Washington. 



Sedum treleasei Rose, sp. nov. Plate 60. 



Perennial; stems woody at base, numerous, at first erect but finally procumbent 

 and even pendulous in its native haunts, glaucous; leaves closely set, especially toward 

 the ends of the branches, standing nearly at right angles to the stems, very glaucous, 

 thick but decidedly flattened, 2.5 to 3.5 cm. long, obtuse, rounded below with the tip 

 slightly turned up, the upper face slightly concave; flowering branches weak, slender, 

 ascending or drooping, arising from the axils of upper stem-leaves, pinkish, the leaves 

 narrow, obtuse; cymes sessile, Bmall, about3cm. broad, compact ; pedicels very short; 



