216 



Descriptive Flora 



simple, alternate. Blades rigid, narrow, entire, 1 to 4 inches 

 long, finely dotted with glands. Flowers composite, composed of 

 3 to 7 slender, tubular, rose-purple corollas and protruding pur- 

 ple stigmas that give each flower a f ringy appearance. Rays none. 

 Achenes oblong or club-shaped, tipped by a crown of feathery 

 hair-like bristles. Stems spring from thick, onion-shaped tubers 

 close to the surface of the ground. Blossoms in September and 

 October. Dry limestone hills and hillsides. 



Coleosanthus riddellii (Torr. & Gray) Kuntze 

 (Brickellia riddellia A. Gray.) 



Late fall blossoming plant with greenish-yellow, composite 

 flowers and slender stems leafy above and woody below. Leaves 

 simple, alternate, numerous. Blades lanceolate to oblong-lanceo- 

 late, rough-veiny underneath, % to iy 2 " long, entire or coarsely 

 toothed. Flowers composite, composed of 15 to 20 tubular 

 corollas packed in slender, greenish-yellow heads, about y£ high. 

 Bracts of the involucre numerous, slender, pointed, in several 

 rows. Achenes minute, tipped by feathery bristles. Blossoms 

 in September, October and November. Common along roadsides 

 and in pastures north and northwest of the city. 



ColeosantJtus cylindmceous (Gray & Engelm.) Kuntze. 



Similar to ColeosantTius riddellii in general appearance but 

 plants are thickly crowded with leaves. Leaves are broader, 

 usually ovate, very resinous,, firmer, 1 to 2 inches long, toothed 

 or serrate-crenate, 3-nerved at base, yellowish-green. Involucres 

 higher (10-llmm.) Grows in bushy forms, 1 to 3 feet high, the 

 numerous stems unbranched at the base and conspicuously leafy 

 and resinous all the way up the stems. Flowers solitary or in 

 twos in the upper leaf axils. In C. Riddellii the flowers blossom 

 near the tips of the branches and form a loose, more or less flat- 

 topped cluster. Late fall. Common in gravel pits and dry, 

 rocky creek beds. 



Kuhnia rosmarini folia Vent. False Boneset. 



Late, greenish-yellow flowering plants, branched at the root, 



