58 NORTH AMERICAN FLORA [V01.UME 22 



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6. Rhodiola roanensis Britton, Bull. N. Y. Bot. Gard. 3 : 39. 1903. 



Sedum roanense Britton ; Small, Fl. SE. U. S. 497. 1903. 



Stems tufted, stout, leafy, 1.5-2.7 dm. high. Ivcaves oblanceolate, entire, or rarely 

 with 1 or 2 minute teeth, obtusish or acute, narrowed at the base, 2-3 cm. long, 5-9 mm., 

 wide, the lower much smaller and shorter ; cymes dense, 2-3 cm. broad ; flowers very 

 short-pedicelled ; petals lanceolate, purple, or purplish ; follicles 8-10 mm. long, the short 

 widely spreading beak about 1 vcivn. long. 



Type i-OCality : Roan Mountain, Mitchell County, North Carolina, 

 Distribution : Summit of Roan Mountain. 



23. SEliASTRUM Rose, gen. nov. 



Cespitose perennials ; stems numerous, arising from dense basal rosettes of leaves and 

 dying down to the base after flowering. Stem-leaves alternate, fleshy but more or less 

 flattened, usually broad. Inflorescence more or less paniculate and leafy ; the branches 

 arising from the axils of leaves, bearing scattered sessile flowers. Calyx green, deeply 

 cleft. Corolla white or at least whitish, with usually distinct spreading lobes. Stamens 8 or 

 10, the 4 or 5 opposite the sepals .distinct, the others borne on the petals. Carpels ovate, 

 erect, concave under the scales, the styles slender, little if at all spreading. 



Type species, Sedum incertum Hemsley. 



Plants glabrous throughout. 1. .S*. glabrum. 



Plants more or less pubescent, especially the rosette of leaves. 

 Stem leaves narrow, several times longer than broad. 



lyCaves linear-oblong, very pubescent. 2. 5". Hemsleyanum. 



I^eaves oblanceolate, slightly hairy. 3.- S. Painieri. 



Stem leaves orbicular to broadly oblong, little if at all longer than broad. 

 Stems as well as leaves pubescent. 



Stems very pubescent, green. 4. S. ebracteatum. 



Stems slightly pubescent becoming purplish. 5. S. ruhricaule. 



Stems glabrous or nearly so. 



Leaves ovate, more or less pointed, thin for the genus. 6. S. chalapense. 



I^eaves oval, obtusish. 7. S. incertum.. 



1. Sedastrum glabrum Rose, sp. nov. 



Perennial with rather large rosettes of leaves, these ovate, obtuse, and very thick especi- 

 ally in the upper half, glabrous. Stems about 20 cm, long, leafy throughout, glabrous ; 

 flowering branches bearing a few sessile flowers ; sepals ovate, obtuse ; petals white, 

 spreading, obtuse ; carpels erect, hollowed about the gland. 



CoHected at Saltillo, Mexico, by Dr. E- Palmer in 1896 («o. 585, type) and in 1902. 



2. Sedastrum Hemsleyanum Rose. 



Sedum Hemsleyanum Rose, Bull. N. Y. Bot. Card. 3 : 41. 1903. 



I 



Perennial, caulescent, 1-3 dm. high, branching, puberulent. Inflorescence an elon- 

 gated panicle ; flowers sessile, arranged along one side of the axes ; cal3rx-lobes broadly ovate, 

 obtuse, 1.5 mm. long; petals white, 4 mm. long, ovate, acuminate; carpels 5, tipped with 

 long slender styles. 



Type locality : Near Oaxaca City, Mexico. 

 Distribution : Oaxaca, Puebla, Vera Cruz. 



3. Sedastrum Painteri Rose, sp. nov. 



Perennial ; basal rosettes of small spatulate leaves somewhat pubescent on the margin, 

 about 1 cm. long, flat but fleshy. Stems glabrous or nearly so, somewhat colored by red- 

 dish longitudinal lines; leaves turgid, 1-1.5 cm. long, with a broad half-clasping base, ob- 

 tuse, glabrous or nearly so ; inflorescence, few-branched ; flowers sessile ; calyx deeply 

 parted, the lobes erect, green ; corolla white, the lobes widely spreading ; stamens 10 (or 

 8), free to the base, 5 inserted on the corolla-lobes one fourth the distance above the base ; 

 carpels 4 or 5, erect, with slender styles. 



Collected by J. N, Rose and Jos. H. Painter near Cuernavaca, Mexico, September, 1903 {no. 

 796), and described from specimens which flowered in Washington in November, 1903. Here is 

 doubtless to be referred Bourgeau's no. 1182 also from Cuernavaca, referred to but not named by 

 Mr. Hemsley in Biol. Centr. Am. Bot. 1: 396. 



