994 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



1. Porophyllum macrocephalum DC, Prodr. 5: 648. 1836. 

 Cochise, Santa Cruz, and Pima Counties, from the Huachuca to 



the Baboquivari Mountains, 3,500 to 5,000 feet, rocky slopes and 

 canyons, August to October. Southern Arizona, south to South 

 America. 



2. Porophyllum gracile Benth., Bot. Voy. Sulph. 29. 1844. 



Porophyllum : j unciform e Greene, Leaflets 2: 154. 1911. 

 Porophyllum leucospermum Greene, ibid. p. 155. 

 Porophyllum putidum A. Nels., Amer. Jour. Bot. 18: 440. 

 1931. 



Grand Canyon (Coconino County) and Mohave County to western 

 Cochise, Pima, and Yuma Counties, 4,000 feet or lower, dry rocky 

 slopes and canyons, March to October, type of P.junciforme from the 

 Mescal Mountains (J\£. E. Jones), type of P. putidum from east of 

 Douglas, Cochise County (Goodding 2277). Southern Nevada, 

 Arizona, southeastern California, Sonora, and Baja California. 



105. PECTIS. 5 Fetid-marigold 



Annual or perennial herbs, usually low, slender-stemmed; leaves 

 opposite, entire, dotted with pellucid glands, almost always ciliate 

 with a few stiff bristles toward the base; heads small, radiate, yellow, 

 the rays often purplish beneath; involucre 1-seriate; achenes slender; 

 pappus of numerous bristles or of few awns or paleae, or reduced to 

 a low crown. 



With remarkable promptitude' after summer rains have fallen, 

 especially in the southern part of the State, the ground is carpeted 

 with the small yellow heads of the strong-smelling chinchweed (P. 

 papposa). In New Mexico the flowers of this species are used by 

 the Indians for seasoning meat. It is reported that in Arizona the 

 Hopi Indians use P. angustifolia for food and seasoning, either raw 

 or dried, and extract a dye from the plant. 



Key to the species 



1. Pappus of 2 to 6 lanceolate, acuminate, more or less scarious paleae; low and 

 diffuse annuals; leaves oblanceolate to nearly linear, with scattered oil 

 glands; heads sessile or essentially so, much surpassed by the subtending 

 leaves (2). 



2. Involucre finely puberulous or hispidulous 3. P. urceolata. 



2. Involucre glabrous (3) . 



3. Phyllaries 5 1. P. prostrata. 



3. Phyllaries 3 2. P. cylindrica. 



1. Pappus of bristles or of stout, not paleaceous awns, or sometimes of short 



squamellae, rarely reduced to a low crown (4) . 



4. Pappus of 2 to 6 rigid, subulate, corneous awns, sometimes also with a few 



short squamellae (5) . 



5. Plant definitely perennial, from a woody rootstock; stems relatively tall, 



30 to 100 cm. high, erect, stiff; leaves normally without basal bristles; 



pappus usually partly of erect subulate awns and partly of short 



squamellae 4. P. imberbis. 



5. Plants annual (sometimes perennial in P. coulteri ?) ; stems low and 



diffuse, or else not rigid; leaves usually with basal bristles; pappus 



usually wholly of stout subulate awns (6) . 



6. Pappus of 2 to 6 retrorsely barbed spreading awns; plant diffuse; leaves 



conspicuously bristle-toothed at base 5. P. coulteri. 



5 Reference: Fernald, M. L. a systematic study of the united states and Mexican species of 

 pectis. Amer. Acad. Arts and Sci. Proc. 33 (Gray Herbarium Contrib. 12): 57-86. 1897. 



