376 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



Much more common in Arizona is var. griffithsii (Rose) Kearney and 

 Peebles (S. griffithsii Rose) , with basal leaves distinctly papillate. The 

 type of S. griffithsii was collected in the Santa Rita Mountains, Pima 

 County (Griffiths 6061). 



2. ECHEVERIA 



Plants perennial, succulent; stems scapose; leaves of the stem alter- 

 nate, bractlike, the basal ones much larger, in a rosette; flowers in 

 cymes or open panicles; calyx lobes and petals 5, the petals united 

 below into a cylindric or funnelform tube. 



Key to the species 



1. Corolla broadly campanulate or rotate-campanulate, the lobes spreading, at 

 least as long as the tube, pale or greenish yellow and transversely banded 

 or irregularly blotched with red; stamens in age often spreading or deflexed 

 outside the corolla: Subgenus Graptopetalum (2). 

 2. Basal leaves not more than 3.5 cm, long; scapes (including the inflorescence) 

 less than 25 cm. long; inflorescence a broad, very open cyme; sepals 

 oblong, spatulate, or obovate, very obtuse; valves of the carpels grad- 

 ually attenuate into the styles 1. E. RUSBYI. 



2. Basal leaves up to 6 cm. long; scapes and inflorescence up to 30 cm. long; 



inflorescence an elongate panicle, broad and much branched, or narrow 

 and subracemose; sepals narrowly deltoid to oblong-lanceolate, acute or 

 acuminate; valves of the carpels abruptly tipped with the styles. 



2. E. BARTRAMII. 



1. Corolla cylindric or tubular-funnelform, the lobes erect or slightly spreading at 

 apex, bright j T ellow or red, not banded or blotched; stamens not exserted: 

 Subgenus Dudleya (3). 



3. Basal leaves abruptly acuminate, ovate-lanceolate to rhombic-ovate, 



usually widest above the base, the larger ones 2 to 4 cm. wide; calyx 4 

 to 5 mm. long, green when fresh; corolla 10 to 12 mm. long, deep red 

 to apricot yellow fading reddish, the tube about equaling the lobes and 



longer than the calyx 3. E. arizonica. 



3. Basal leaves gradually long-acuminate, lanceolate, widest at or near the 

 base, not more (usually less) than 2 cm. wide; calyx 5 to 8 mm. long, 

 bright red when fresh; corolla 12 to 17 mm. long, clear yellow, the tube 

 shorter than the lobes and shorter than the calyx 4. E. collomae. 



1. Echeveria rusbyi (Greene) Nels. and Macbr., Bot. Gaz. 56: 476. 



1913. 



Cotyledon rusbyi Greene, Torrey Bot. Club Bui. 10: 125. 1883. 

 Graptopetalum rusbyi Rose, Addisonia 9:31. 1924. 

 Graptopetalum orpettii E. Walther, Cactus and Succulent 

 Soc. Amer. Jour. 1: 185. 1930. 



Greenlee, Graham, Gila, Maricopa, Pinal, and Pima Counties, 

 2,500 to 5,000 feet, open places among rocks, May, type of Cotyledon 

 rusbyi from the San Francisco River region, Greenlee County (Rusby 

 in 1881), type of Graptopetalum orpettii from near Superior, Pin 

 County (Howard) . Known only from Arizona. 



2. Echeveria bartramii (Rose) Kearney and Peebles, Wash. Acad. 



Sci. Jour. 29: 479. 1939. 



Graptopetalum bartramii Rose, Addisonia 11: 1. 1926. 



Patagonia and Tumacacori Mountains (Santa Cruz County), 

 Baboquivari Mountains (Pima County), 4,000 to 5,000 feet, growing 

 with scrub oaks, September to February, type from the Patagonia 

 Mountains (Bartram in 1924). Known only from southern Arizona. 



The flowers are reported to be ill-scented. 







