FLOWERIXG PLANTS AND FERXS OF ARIZONA 707 



Key to the species 



1. Bracts larger than the sepals, ovate, obtuse or apiculate, inserted immediately 

 below the calyx and enclosing it; stigmas oblong or oval; herbage glabrous 

 or soft-pilose"; leaf blades deltoid-hastate; corolla 3 to 6 cm. long, white 

 or pink 1. C. SEPIUM. 



1. Bracts much smaller than the sepals, remote from or not closely subtending 



the calyx; stigmas linear, filiform, or slender-clavate (2). 



2. Leaf blades shallowly sagittate or hastate with short, entire or sparingly 



dentate, triangular-ovate basal lobes, oblong or oblong-ovate, commonly 



very obtuse; herbage glabrous or sparsely soft-pilose; bracts seldom more 



than 5 mm. long, lanceolate, oblanceolate, or narrowly oblong; corolla 



white or striped with pink, 1.5 to 2.5 cm. long 2. C. arvensis. 



2. Leaf blades hastately lobed, some of them usually with elongate, linear or 

 lanceolate lobes (3) . 

 3. Herbage and calyx sericeous, rarely glabrate; peduncles seldom more than 

 twice as long as the subtending leaf; bracts 2 to 3 mm. long, subulate; 

 corolla not more than 2 cm. long, usually pink, drying purplish; 

 anthers 2 mm. long; leaf blades narrowly lanceolate to oblong, the 

 basal lobes usually several-toothed or cleft; sepals truncate, emargi- 



nate, and usually mucronate at apex 3. C. incanus. 



3. Herbage and calyx glabrous, often slightly glaucous; peduncles usually 

 3 or more times as long as the subtending leaf; bracts up to 15 mm. 

 long, linear-lanceolate; corolla 3 to 4 cm. long, pale pink or white; 

 anthers 3 to 4 mm. long; leaf blades deeph' hastate, the basal lobes 

 narrowly linear to lanceolate, entire or coarsely few-toothed; sepals 

 truncate to acutish, entire or somewhat erose and conspicuously 

 mucronate at apex 4. C. linearilobus. 



1. Convolvulus sepium L., Sp. PL 153. 1753. 



Lakeside, Navajo County {Harrison 5506), about 6,000 feet, June. 

 Throughout most of temperate North America; Eurasia. 



Hedge bindweed. The plant is sometimes a troublesome weed. 



2. Convolvulus arvensis L., Sp. PI. 153. 1753. 



Apache County to Coconino County, south to Cochise, Santa 

 Cruz, and Pima Counties, roadsides and fields, May to July. Exten- 

 sively naturalized in North America, from Europe. 



Field bindweed. A troublesome weed, difficult and expensive to 

 eradicate, considered in California the worst weed in the State. 



3. Convolvulus incanus Vahl, Symb. Bot. 3: 23. 1794. 



Navajo and Coconino Counties to Cochise and Pima Counties, 

 3,000 to 5,500 feet, common on dry slopes and mesas, May to Sep- 

 tember. Nebraska and Colorado to Texas and Arizona. 



Stems trailing or clambering over bushes. 



4. Convolvulus linearilobus Eastw., Calif. Acad. Sci. Proc. ser. 4, 20: 



152. 1931. 



Mohave, Yavapai, and Gila Counties, chiefly in the Mazatzal and 

 Hualpai Mountains, 3,400 to 5,000 feet, slopes and banks, often among 

 oaks, May to October, type from the Mazatzal Mountains {Eastwood 

 17264). Known only from central Arizona. 



This species is closely related to C. longipes Wats, of Nevada and 

 southern California. The numerous long stems often form tangled 

 masses. The narrowly lobed leaves and the large, pale pink or white 

 flowers are distinctive. 



