374 CRASSULACEAE 



ers perfect, cymose or thyrsoid. Sepals distinct or nearly so. Petals 5, united 

 below the middle, yellow or red, acute or acuminate. Stamens 10, adnate to 

 the corolla; anthers mostly oblong. Carpels 5, united below, erect or nearly so, 

 many-seeded. 



1. G. debilis (S. Wats.) Britton. Perennial, with a slender rootstock; stems 

 often decumbent at the base, 3-12 cm. high; leaves ovate-orbicular, or the upper 

 ones oblong, obtuse, sessile; cyme 2-5 cm. broad; corolla yellow; lobes lanceo- 

 late, 6-8 mm. long. Sedum debile S. Wats. Rocky ridges: Utah Nev. Ore. 

 Ida. Submont. Mont. Je-Au. 



3. RHODIOLA L. ROSE-ROOT, ROSE-WORT. 



Perennial, with a thick, red, somewhat branching rootstock. Flowers polyga- 

 mous or dioecious, 4- or 5-merous. Leaves broad and soft, not very thick. Sepals 

 distinct, oblong or lanceolate. Petals rather narrow, distinct, yellowish or green- 

 ish, or in our species purplish. Carpels erect, only the beaks spreading. 



Petals acute; follicles 3-5 mm. long, the beak 0.5 mm. long, divergent or recurved; 



dioecious. 1. R. integrifoUa. 



Petals abruptly acuminate; follicles 6-8 mm. long; the beak 1 mm. long, ascending; 



polygamo-dioecious. 2. R. polygama. 



1. R. integrifolia Raf. Stems usually less than 1 dm. high; leaves flat, 

 1-1.5 cm. long, obovate or oblong-obovate, often dentate above the middle; 

 sepals lanceolate, acute, 1.5-2 mm. long, dark purple or rarely greenish; petals 

 oblanceolate or oblong, acute, about 3 mm. long, usually dark purple. Sedum 

 Rhodiola Coult. S. frigidum Rydb. Alpine-arctic situations, among rocks: Alta. 

 Colo. Calif. Alaska. Alp. Subalp. Je-Au. 



2. R. polygama (Rydb.) Britt. & Rose. Stem 1-3 dm. high: leaves obovate 

 or oblanceolate, acute, sessile, flat, entire or minutely denticulate, 1.5-2.5 cm. 

 long; sepals lanceolate, 2 mm. long, acute; petals oblanceolate, dark purple, 

 about 3 mm. long. Sedum polygamum Rydb. Alpine peaks: Colo. N.M. 

 Alp. Mont. Je-Au. 



4. SEDUM L. STONE-CROP, ORPINE. 



Annual or perennial, fleshy herbs. Leaves mostly alternate, often imbricate, 

 entire or dentate. Flowers perfect, in terminal, often one-sided cymes. Sepals 

 distinct or somewhat united, 4 or 5. Petals 4 or 5, distinct, or rarely slightly 

 united at the base. Stamens 8-10, the alternate ones often adnate to the base 

 of the petals. Carpels 4 or 5, distinct, or united at the very base, more or less 

 spreading or at least ascending, usually many-seeded. 



Leaves linear, linear-oblanceolate, or oblong, terete or nearly so. 1. S. stenopetalum. 

 Leaves lanceolate to oblong or spatulate, more or less flattened. 



Leaves of the flowering stems lanceolate, broadest at the base. 2. S. Douglasii. 



Leaves spatulate or obovate, narrow at the base. 3. 5. Leibergii. 



1. S. stenopetalum Pursh. Perennial, tufted; flowering stems 8-18 cm. 

 high; leaves crowded, but scarcely imbricate, except on the sterile shoots, sessile, 

 linear, 6-16 mm. long; cymes forked; petals yellow, narrowly lanceolate; follicles 

 about 4 mm. long, ascending, with divergent tips. S. subalpinum Blankinship. 

 On rocks: Sask. 'Neb. N.M. Calif. Alta. Plain Mont. Je-Au. 



2. S. Douglasii Hook. Perennial, with a branching rootstock; stems erect 

 or ascending, 1-3 dm. high; leaves narrowly lanceolate or linear-lanceolate, 

 acuminate, sessile, 1-2.5 cm. long, flat above; cyme forked; petals 6-12 mm. 

 long, yellow, longer than the stamens; follicles 3-4 mm. long, widely divergent 

 from the base. Rocky places: Mont. Ida. Calif. B.C. Submont. Mont. 

 Je-Au. 



3. S. Leibergii Britton. Perennial, with a rootstock; stem simple, about 

 2.5 cm. high; leaves, except those of the inflorescence, oblanceolate or spatulate, 

 1-1.5 mm. long; cyme open; flowers sessile; petals yellow, narrowly lanceolate, 

 acuminate, 7-9 mm. long; follicles divergent from the united bases. Sedum 

 divaricatum S. Wats., not Ait. Rocky places: Ore. Wash. Ida. Son. My-Je. 



