2l6 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



sessile, with a short adpressed spur, set at right angles to the stem and curved 

 upwards, often in five spiral rows, slightly glaucous, tipped red. Flower-stems 

 axillary, about 4 inches long, slender, with leaves similar to those of the barren 

 stems, but spur more pronounced. Inflorescence cymose, dense, flatfish, i^to 2 

 inches across, often pendent, uppermost bracts small, linear. Buds greenish, 

 strongly ribbed, ovate, acute. Flowers f inch across, pedicels short, slender. 

 Sepals spreading, linear or club-shaped, terete, blunt, unequal, pale green. 

 Petals wide-spreading or slightly reflexed, ovate-lanceolate, bright yellow, 

 slightly exceeding the longest sepal. Stamens wide-spreading, yellow, equalling 

 the petals. Scales very short, twice as broad as long, yellow. Carpels erect, 

 later slightly spreading, greenish yellow, shorter than the stamens, styles 

 slender. 



Flowers January (Washington), April (Glasnevin, gentle heat). 

 Not h-ardy. 



Habitat. — Oaxaca, Mexico. 



Received from Washington, Kew, and Edinburgh. 



Its name pachyphyllum (= thick leaf) emphasizes one of its leading 

 characters. 



99. Sedum Treleasei Rose (fig. 124). 



S. Treleasei Rose in "Contrib. U.S. Nat. Herb.," 13, 300, 1911. 



Illustration. — Loc. cit.-, pi. 60 (photo.). 



This striking plant belongs to the massive, fleshy-leaved section 

 of the Mexican Sedums. In growth and leaf it comes near 5. Adolphi 

 Hamet, but in the latter the leaves are only half as thick, of a 

 firmer texture, and in colour yellowish flushed with red, while in 

 5. Treleasei they are densely glaucous-pruinose. The flowers of 

 S. Treleasei are bright yellow, of 5. Adolphi white. In inflorescence 

 and flower 5. Treleasei much resembles S. pachyphyllum Rose, but 

 that species has club-shaped, terete leaves like those of 5. allantoides 

 Rose. 



Description. — A very fleshy, glaucous, evergreen perennial. Roots fibrous. 

 Stems at first erect, later ascending or sprawling, branched, smooth, round, 

 \ inch or more thick, ultimately rather woody. Leaves alternate, rather crowded, 

 sessile, set at right angles to the stem, curved upwards, oblong-obovate, bluntly 

 pointed at apex, broad at base, almost flat on face, semicircular in section, of a 

 rather soft fleshiness, very glaucous-pruinose, about ij inch by | inch by J inch. 

 Flowering branch lateral, from one of the uppermost leaf-axils, slender, erect, 

 pinkish, 3-5 inches long, clothed with a few (6 to 1 2) small, oblong leaves. Inflores- 

 cence erect or nodding, cymose, of several forked branches, compact, sub- 

 globular, I to i^ inch across, bracts few, minute. Flowers on short pedicels, \ inch 

 across, bright yellow. Buds obovate, strongly ribbed, greenish. Sepals very 

 unequal, linear-lanceolate, acute, very fleshy, glabrous, greenish. Petals about 

 twice the average sepal, ovate-lanceolate, acute, \ inch long, patent or reflexed. 

 Stamens equalling the petals, spreading, bright yellow, filaments tapering. 

 Scales small, quadrate, slightly longer than broad, lightly emarginate, orange. 

 Carpels erect, contracting rather abruptly into long, slightly divergent styles, 

 which equal the stamens. 



Flowers April (Glasnevin, gentle heat). Not hardy. 

 Habitat. — Mexico. 



My plants came from Washington, New York, and Edinburgh. 

 Named after Dr. William Trelease, the first collector of the 

 plant. 



