FLOWERING PLANTS AND FERNS OF ARIZONA 709 



10. Calyx and pedicel hirsute; sepals 8 to 12 mm. long; corolla with 

 the tube and throat 20 to 25 mm. long, the limb 25 to 40 mm. 



in diameter 10. I. leptotoma. 



8. Leaf blades entire or angulate-lobed or, if pedately parted, then the 

 midlobe not less than 6 mm. wide (except sometimes in the upper 

 leaves of /. barbatisepala); stems twining (11). 

 11. Outer sepals conspicuously dilated toward the base, attenuate- 

 acuminate toward the apex, not scarious-margined, the inner ones 

 much narrower, lanceolate, scarious-margined toward the base; 

 stems, leaves, and calyx sericeous with long, very fine, more or 

 less appressed hairs, these not postulate at base; leaf blades 

 pedately 5- to 7-parted, the midlobe strongly constricted at base; 

 corolla 6 to 9 cm. long; capsule 5-celled_ _ 11. I. heterophylla. 

 11. Outer sepals not conspicuously dilated toward the base, much like 

 the inner ones; stems, leaves, and calvx not sericeous; capsule 2- 

 or3-celled (12). 

 12. Calyx hispid, the hairs stout, conspicuously subulate, mostly 2 to 

 3 mm. long; stems and leaves glabrous; petioles usually sparsely 

 beset with elevated, pricklelike warts; leaf blades pedately 3- 

 to 5-parted, the basal lobes usually deeply cleft; sepals narrmvly 

 lanceolate; corolla about 2 cm. long__ 12. I. barbatisepala. 

 12. Calyx villous, hirsute, or glabrous, the hairs, if any, very slender, 

 not conspicuously subulate (13). 

 13. Leaf blades all entire, cordate (14). 



14. Stems, leaves, and calyx glabrous; peduncles mostly 1- 

 flowered; calyx and pedicel rugose-verrucose; sepals 

 ovate, 4 to 5 mm. long at anthesis, scarious-margined to 

 the apex; corolla 2 to 3 cm. long_ 13. I. cardiophylla. 



14. Stems, leaves, and calyx more or less hirsute ; peduncles mostly 



2- to several-flowered; calyx and pedicel not rugose-verru- 

 cose but the bases of the hairs often enlarged; sepals 

 lanceolate or somewhat spatulate, 8 to 25 mm. long at 

 anthesis, not scarious-margined to the apex; corolla 4 to 6 



cm. long 14. I. purpurea. 



13. Leaf blades (some or all of them) angulate-lobed or more deeply 

 cleft (15). 



15. Corolla not more than 2 cm. long, narrowly funnelform; 



calyx at anthesis less than 10 mm. long, the sepals ovate 

 or lance-ovate, scarious-margined, usually conspicuously 

 so, sparsely villous, long-ciliate, or glabrous; stems glabrous 

 or sparsely villous; leaf blades commonly glabrous, deeply 

 3-lobed, or some of them entire and deeply cordate. 



15. I. TRILOBA. 



15. Corolla 2.5 to 4 cm. long, broadly funnelform; calyx at anthe- 

 sis at least 10 mm. long, the sepals lanceolate, not or not 

 conspicuously scarious-margined, copiously villous-hirsute; 

 stems and leaves more or less villous-hirsute; leaf blades 

 angulate-lobed to pedately 5-parted_. 16. I. hirsutula. 



1. Ipomoea coccinea L., Sp. PL 160. 1753. 



Quamoclit coccinea Moench, Meth. PL 453. 1794. 



Coconino County to Cochise, Santa Cruz, and Pima Counties, 

 3,500 to 5,500 feet, hillsides and canyons, May to October. Western 

 Texas to Arizona and southward into tropical America. 



Easily distinguished from all the other Arizona species by the 

 scarlet, narrowly trumpet-shaped corolla, The typical form," with 

 cordate or subsagittate, otherwise nearly entire leaf blades, is less 

 common in Arizona than var. heden [folia (L.) Gray (/. hederi folia L.) 

 with some or all of the blades deeply 3-lobed to pedately 5-parted. 



2. Ipomoea longifolia Benth., PL Hartw. 16. 1839. 



Cochise and Santa Cruz Counties, 4,000 to 6,000 feet, plains and 

 mesas, usually with grasses, July and August. Oklahoma to southern 

 Arizona and Mexico. 



