1522 COXTRIBITTIONS FROM THE NATIONAL HERBARIUM 



43. HYMENOCLEA Torr. & Gray, Mem. Amer. Acad. n. ser. 4: 79. 1849. 



Reference: Rydberg, N. Amer. Fl. 33: 13-15. 1922. 



Slender much-branched shrubs; leaves alternate, linear-filiform, entire or pin- 

 nately trisect; heads monoecious, glomerate-spicate, leafy-bracted; phyllaries of 

 the staminate involucre few, united to middle; involucre of the pistillate heads 

 gamophyllous, fusiform, beaked, inclosing a single flower, and bearing transverse, 

 orbicular or obovate, scarious, spreading wings. 

 Wings of the fruit spirally arranged, suborbicular, the lower 6 to 8 mm. wide. 



1. H. salsola. 

 Wings of the fruit in a single whorl, much narrower. 



Wings 7 to 12; body of fruit about 4 mm. long 2. H. monogyra. 



Wings usually 5; body of fruit about 6 mm. long 3. H. pentalepis. 



1. Hymenoclea salsola Torr. & Gray, Mem. Amer. Acad. n. ser. 4: 79. 1849. 

 Northern Baja California and Sonora. Utah to Arizona and California; type 



from the Mohave River, California. 



About 1 meter high; leaves few, mostly 3 cm. long or less; pistillate involucre 

 in fruit about 6 mm. long. 



2. Hymenoclea monogyra Torr. & Gray, Mem. Amer. Acad. n. ser. 4: 79. 



1849. 



Sonora, Sinaloa, Chihuahua, and Baja Cahfornia. California to Texas; type 

 from the Valley of the Gila. 



Up to 4 meters high; leaves usually about 4 cin. long; wings of fruit narrowly 

 obovate. "Romerillo" (Sinaloa). 



A characteristic shrub of sandy arroyos, where it often forms dense thickets. 

 It is employed locally as a remedy for pains in the abdomen. 



3. Hymenoclea pentalepis Rydb. N. Amer. Fl. 33: 14. 1922. 



Sonora and Baja California. Arizona and California; type from Pima Canyon, 

 Arizona. 



Similar to H. monogyra; fruit larger, with broadly obovate-fiabelliform wings. 



44. FRANSERIA Cav. Icon. PI. 2: 78. pi. 200. 1793. 

 Reference: Rydberg, N. Amer. Fl. 33: 22-37. 1922. 



Herbs or shrubs, monoecious; leaves chiefly alternate; heads spicate, racemose, 

 or paniculate, discoid; phyllaries of staminate involucres 1-seriate, united to 

 middle; fertile involucres bur-like, 1 to 8-celled, 1 to 8-fiowered, beaked, armed 

 with 2 to many series of often hooked spines. 

 Leaves simply or doubly dentate, rarely 3 or 5-lobed. 



Leaves coarsely spinose-toothed 15. F. ilicif olia. 



Leaves not spinose-toothed. 



Leaves elongate-triangular, 3 to 5 times as long as wide; fruiting involucre 

 densely covered with strongly hooked spines, these not flattened at base. 



14. F. ambrosioides. 

 Leaves broader; spines of fruit flattened at base, usually not hooked. 



Leaves doubly dentate or 3 or 5-lobed, green beneath (sometimes tomen- 



tose when young in F. cordifolia) . 



Leaves not trilobed to middle (except sometimes on sucker shoots), 



pubescent or puberulous beneath with more or less spreading 



hairs; spines and body of fruiting involucre densely stipitate- 



glandular 7. F. cordifolia. 



Leaves 3 or 5-lobed to middle, strigillose on both sides; spines of fruit- 

 ing involucre sparsely pilosulous, obscurely glandular. 



8. F. divaricata. 



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