ROSE MEXICAN AND CENTRAL AMERICAN PLANTS. 299 



This species is reluctantly referred to Sedum, although in habit and foliage it sug- 

 gests Lenophyllum. 

 Sedum liebmannianum Hemsl. Plate 56. 



Perennial, procumbent and creeping, freely rooting at the joints, with ascending or 

 erect branches; branches when young fleshy, green, when old completely hidden by 

 the white bases of the dead leaves; leaves fleshy, narrow, bright green, 4 to 6 mm. 

 long, generally obtuse, broad at the base; flowers few, in small cymes; pedicels sub- 

 sessile; sepals linear, leaf-like; petals white, spreading; anthers purplish, oblong; 

 scales short, retuse; ovaries oblong, erect, longer than the styles. 



Collected by C. A. Purpus on limestone slope of Mesa de Coscomati, Oaxaca, Mex- 

 ico (no. 422). Living material was sent to Washington, which flowered in June, 1909. 



I at first considered this species undescribed and was about to publish it as such 

 when I discovered that it was probably Sedum liebmannianum, which species has 

 recently been referred to Sedum moranense. My reference of it to Sedum liebmannia- 

 num has been confirmed at Kew, although its distinctness from Sedum moraney\se is 

 questioned. Living material of both species has long been under observation in 

 Washington and their distinctness can hardly be questioned. 

 Sedum mellituluni Rose, sp. nov. Plate 57. 



Small, compact, much branched at base, the individual stems at first erect and 

 nearly simple or in age becoming decumbent, very slender, pinkish, glabrous but 

 slightly roughened; leaves scattered, standing nearly at right angles to the stem, 

 terete, blunt, glabrous, 6 to 8 mm. long, bright green; inflorescence an open spreading 

 cyme of 2 or 3 branches, each branch bearing 3 to 8 flowers; pedicels short (about 2 

 mm. long); sepals nearly or quite distinct, linear, 3 to 4 mm. long; petals a little 

 longer than the sepals, widely spreading, white; filaments white; anthers brownish; 

 pistils white, erect; mature carpels erect. 



Type TJ. S. National Herbarium no. 617435, from material which flowered in Wash- 

 ington, D. 0., originally sent by Marcus E. Jones, who collected it in the Sierra Madre, 

 30 miles west of Colonia Juarez, Chihuahua, in 1903. Material has been in cultivation 

 in Washington for over seven years under the name of S. alamosanum, as which it has 

 been widely distributed. In 1910 the writer collected the true Sedum alamosanum, 

 which has since been grown side by side with the present species. The two species 

 are related but can easily be distinguished. 

 Sedum oaxacanum Rose, sp. nov. 



Stem creeping, rooting at the joints, reddish, somewhat roughened; leaves rather 

 closely set but not imbricated, usually standing nearly at right angles to the stem, 

 thick but not terete, rounded on the back, flat on the face, obtuse, with broad base, 

 glabrous, 5 to 6 mm. long; flowers solitary, terminal, sessile, or sometimes as many as 

 4 in a small terminal cyme; sepals linear, 3 mm. long, distinct nearly to the base; 

 petals yellow, distinct, longer than the sepals; stamens 10; carpels 5, widely spread- 

 ing, with long styles. 



Type U. S. National Herbarium no. 462270, collected by Dr. C. G. Pringle on mossy 

 ledges of Cerro San Felipe, Oaxaca, May 18, 1906 (no. 10243). 



Living material was sent me by Prof. C. Conzatti, but it died in a short time. Unfor- 

 tunately it was not photographed. 



It is not near any of our other known Mexican species, but suggests somewhat 

 5. australe of Guatemala, than which it is a weaker plant with smaller leaves. 

 Sedum pachyphyllum Rose, sp. nov. Plate 58. 



Perennial; stems woody at base, much branched, spreading or erect, glabrous 

 throughout, 10 to 30 cm. high; leaves closely set, standing almost at right angles to 

 the stem, terete in section, somewhat smaller below, obtuse, a little glaucous, 3 to 4 

 cm. long, 8 to 10 mm. in cross section; flowering stem weak, about 2 cm. long; inflo- 

 rescence sessile, cymose; flowers short-pediceled or subsessile; sepals 5, widely spread- 

 ; ng, clavate, green, obtuse, somewhat unequal, the longest one 6 mm. long; petals 

 70271°— vol 13, pt 9—11 2 



