FLOWERING PLANTS AND FERNS OF ARIZONA 669 



Key to the species 



1. Leaf blades thin, bright green, ovate or ovate-oblong, not or scarcely more 

 than twice as long as wide, sinuate to coarsely dentate, rounded, truncate, 

 or subcuneate at base, abruptly contracted into petioles often longer than 

 the blades; flowers usually very few, sometimes solitary; corolla lobes 

 white 1. D. ELLISIAE. 



1. Leaf blades thickish, dull green, oblanceolate, more (often much more) than 



twice as long as wide, entire or subsinuate, tapering into petioles shorter 



than the blades; flowers commonly 4 to 6; corolla lobes pink, drying 



purple (2). 



2. Filaments very short or nearly obsolete, purple; leaf blades up to 10 cm. 



long 2. D. RADICATUM. 



2. Filaments well developed, one-third as long to equaling the anthers, yellow, 

 leaf blades seldom more than 5 cm. long 3. D. pauciflorum; 



1. Dodecatheon ellisiae Standi., Biol. Soc. Wash. Proc. 26: 195. 



1913. 



Pinaleno Mountains (Graham County), Santa Catalina Mountains 

 (Pima County), 8,000 to 9,500 feet, rich moist soil in coniferous for- 

 ests, June to August. New Mexico and southern Arizona. 



Resembles D. dentatum Hook., but the anthers are pointed and the 

 short caudex is vertical. 



2. Dodecatheon radicatum Greene, Erythea 3: 37. 1895. 

 Apache, Navajo, and Coconino Counties, 6,200 to 10,000 feet, 



June to August. South Dakota and Wyoming to New Mexico and 

 Arizona. 



3. Dodecatheon pauciflorum (Durand) Greene, Pittonia 2: 72. 



1890. 



Dodecatheon meadia L. var. pauciflorum Durand, PI. Pratten. 

 95. 1855. 



"Northern Arizona" (Palmer 298, in 1877). Saskatchewan to 

 British Columbia, south to Colorado, Arizona, and California. 



96. PLUMBAGINACEAE. Plumbago family 



1. PLUMBAGO 



Plant suffrutescent; leaves alternate, simple, with entire blades; 

 flowers nearly sessile, in panicles of spikelike racemes, perfect, regular; 

 calyx tubular, beset with stipitate glands; corolla gamopetalous, sal- 

 verform, with a long slender tube; stamens 5, separate, free or nearly 

 free from the corolla; capsule circumscissile near the base. 



P. capensis, a South African species with sky-blue flowers, is often 

 cultivated as an ornamental in the warmer parts of the United States. 

 The roots and leaves of P. scandens are reported to cause dermatitis 

 in susceptible persons. 



1. Plumbago scandens L., Sp. PI. ed. 2, 215. 1762. 



Mountains of Pima County, 3,000 to 4,000 feet, in canyons, May 

 to August. Southern Florida, southern Arizona, and widely dis- 

 tributed in tropical America. 



Flowers whitish or tinged with blue. 



97. SAPOTACEAE. Sapote family 



The highly esteemed tropical American fruit sapodilla is produced 

 by Achras zapota L., a tree that also yields chicle, from which chewing 

 gum is manufactured. 



