FLOWERING PLANTS AND FERNS OF ARIZONA 375 



1. SEDUM. Stonecrop 



Plants succulent, perennial; stems erect or decumbent, leafy; 

 leaves simple, entire or dentate, terete or flat, often crowded and 

 imbricate; flowers in terminal cymes; stamens usually 10; pistils 4 or 5, 

 separate or nearly so; follicles several- to many-seeded. 



Key to the species 



1. Flowers in axillary racemes or cymes: plant glabrous: stems erect, up to 30 cm. 

 long, usually numerous; leaves entire or dentate, flat; petals pink or white; 



carpels erect, with spreading tips 1. S. rhodanthum. 



1. Flowers in terminal cymes (2). 



2. Petals yellow, narrow, sharply acuminate; plant with creeping rootstocks 

 and with short leafy sterile shoots at the base, the flowering stems erect 

 or nearly so; leaves mostly linear or lanceolate, the basal ones commonly 

 papillate; cymes mostly narrow and compact, with ascending branches; 

 mature carpels erect or spreading only at the tip, narrowed gradually 



into the style 2. S. stenopetalum. 



2. Petals white, sometimes tinged with purple (3). 



3. Leaves mostly linear or lanceolate, not or not conspicuously broader above 

 the middle, subterete when fresh, the basal ones not noticeably papil- 

 late; cymes broad and open, the branches commonly spreading; petals 

 acute or acuminate; mature carpels strongly divaricate, somewhat 



abruptly contracted into the style 3. S. stelliforme. 



3. Leaves mostly spatulate or obovate, conspicuously broader above the 

 middle, plane even when fresh; cymes commonly small and compact, 

 with short ascending branches; mature carpels erect or spreading only 

 at the tip 4. S. wootoni. 



1. Sedum rhodanthum A. Gray, Amer. Jour. Sci. sei\ 2, 33: 405. 



1862. 



Clementsia rhodantha Rose, N. Y. Bot, Gard. Bui. 3: 3. 1903. 



San Francisco Peaks (Coconino Countv), Baldv Peak (Apache 

 County), 9,000 to 12,000 feet, July to September. Montana to Utah, 

 New Mexico, and Arizona. 



2. Sedum stenopetalum Pursh, Fl. Amer. Sept. 324. 1814. 

 Coconino Countv, north rim of the Grand Canyon (Grand Canvon 



Herb. 1117), Deboschibeko, 6,500 feet (Darsie in 1933), June to 

 August. Alberta to Nebraska, New Mexico, northern Arizona, and 

 California. 



3. Sedum stelliforme S. Wats., Amer. Acad. Arts and Sci. Proc. 20: 



365. 1885. 



Sedum topsenti Raymond-Hamet, Bot. Jahrb. 50: Beibl. 114. 

 26. 1914. 



Apache, Graham, and Cochise Counties, 7,000 to 9,300 feet, August 

 to September, type of S. stelliforme from the Huachuca Mountains 

 (Lemmon 2702), type of S. topsenti from the Chiricahua Mountains 

 (Blumer 2150). New Mexico, Arizona, and Chihuahua. 



4. Sedum wootoni Britton, N. Y. Bot, Gard. Bui. 3: 44. 1903. 

 Apache County to Cochise, Santa Cruz, and Pima Counties, 3,600 



to 11,500 feet, usually on rocks in partial shade 1 , often among mosses, 

 June to October. New Mexico and Arizona. 



This species is perhaps too near S. wrightii A. Gray. The typical form 

 is described as having the basal leaves smooth or very nearly so. 



