FLOWERING PLANTS AND FERNS OF ARIZONA 711 



mesas and plains, September. Western Texas, southern Arizona, and 

 northern Mexico. 



The corolla is purple. Specimens from Cochise County resemble 

 Mexican specimens, but those from the Baboquivari Mountains 

 probably represent a distinct variety, having- the leaf lobes narrower 

 and more attenuate at both ends, the calyx with shorter and less 

 dense pubescence, and the sepals with broader bases and more abrupt 

 tips. 



12. Ipomoea barbatisepala A. Gray, Syn. El. 2 l : 212. 1878. 



Cochise, Santa Cruz, and Pima Counties, 3,000 to 5,000 feet, 

 canyons, etc., climbing on shrubs, August and September. Western 

 Texas, southern Arizona, and Mexico. 



The corolla is normally purplish pink, sometimes white. 



*13. Ipomoea cardiophylla A. Gray, Syn. Fl. 2 l : 213. 1878. 



House (see footnote 15, p. 708, House, p. 258), gives the range as 

 ''western Texas to Arizona and Mexico," but cites no collections, 

 and the writers have seen no specimens from this State. 



14. Ipomoea purpurea (L.) Lam., Tabl. Encycl. 1: 466. 1797. 



Convolvulus purpureus L., Sp. PI. ed. 2, 219. 1762. 



Occasional in cultivated fields in southern Arizona, September. 

 Widely distributed in the United States; naturalized from tropical 

 America. 



One of the cultivated morning-glories, in places a troublesome field 

 weed. 



15. Ipomoea triloba L., Sp. PL 161. 1753. 



Valley of the Santa Cruz River near Tucson, Pima County (Pringle 

 in 1884) . Southern Florida, southern Arizona, Mexico, and southward. 



Pringle 's specimen differs from the common form of the species in 

 having glabrous leaves, sepals, and capsules, and nearly glabrous 

 stems. 



16. Ipomoea hirsutula Jacq. f., Eclog. PL Rar. 1: 63. 1811. 



Ipomoea desertorum House, N. Y. Acad. Sci. Ann. 18: 203. 

 1908. 



Southern Navajo, Graham, Pinal, Cochise, Santa Cruz, and Pima 

 Counties, 1,300 to 5,500 feet, in various situations, July to October. 

 Western Texas to central and southern Arizona, south to Central 

 America. 



Sometimes a weed in cultivated land, especially in cotton fields 

 in Graham County. A common form with elongate sepal tips is 

 /. desertorum House. A similar variation is found occasionally also in 

 /. purpurea. The type of /. desertorum was collected at Tucson 

 (Thomber 29). 



104. POLEMOxNIACEAE. Phlox family 



Plants annual or perennial, herbaceous or suffrutescent; leaves 

 simple or compound; flowers perfect, mostly regular, 5-merous; 

 stamens separately attached to the corolla, inserted equally or un- 

 equally; ovary superior, mostly 3-celled; style usually 3-eleft ; fruit a 

 longitudinally dehiscent capsule. 



An almost wholly American family, comprising many plants with 



