COMPOSITAE (COMPOSITE FAMILY) 799 



1. B. nudata (Michx.) DC. A smooth perennial ; the slender stem 3-8 dm. 

 high, simple or branched from the base, naked above, bearing small heads in a 

 flat-topped corymb. Low pine barrens, N. J., and south w. Sept. 



19. BELLIS [Tourn.] L. DAISY 



Heads many-flowered ; the rays numerous, pistillate. Bracts of the involucre 

 herbaceous, equal, in about 2 rows. Receptacle conical, naked. Achenes 

 obovate, flattened, wingless, and without any pappus. - Low herbs, chiefly of 

 the Old World, either stemless, like the true Daisy, B. PERENNIS L. (which 

 is found as an occasional escape from cultivation), or leafy-stemmed, as is the 

 following. (The Latin name, of uncertain derivation.) 



1. B. integrif61ia Michx. (WESTERN D.) Annual or biennial, diffusely 

 branched, 1-1 dm. high, smoothish ; leaves lanceolate or oblong, the lower 

 spatulate-obovate ; heads on slender peduncles ; rays pale violet-purple. 

 Prairies and banks, Ky., and southwestw. May, June. 



I 



20. CHAETOPAPPA DC. 



Heads several-flowered, radiate ; disk-flowers often sterile. Involucral bracts 

 imbricated in 2 or more rows, the outer shorter. Receptacle flat, naked. 

 Achenes fusiform or compressed ; pappus of 5 or fewer thin nerveless scales, 

 alternating with rough bristly awns, or these wanting. Low southwestern 

 branching animals, with narrow entire leaves and solitary terminal heads ; rays 

 white or purple. (Xa/r?;, a bristle, and irdinros, pappus.) 



1. C. asteroides DC. Slender, 0.5-3 dm. high, pubescent; involucres 

 slender, 4 mm. long; rays 5-12; achenes pubescent. Dry grounds, Mo., 

 and southwestw. 



21. BOLTdNIA L'Her. 



Heads many-flowered ; rays numerous, pistillate. Bracts of the hemispheri- 

 cal involucre imbricated somewhat in 2 rows, appressed, with narrow mem- 

 branaceous margins. Receptacle conical or hemispherical, naked. Achenes 

 very flat, obovate or inversely heart-shaped, margined with a callous wing, or in 

 the ray 3-winged, crowned with a pappus of several minute bristles and usually 

 2-4 longer awns. Perennial bushy-branched smooth herbs, pale green, with the 

 aspect of Aster; the thickish leaves chiefly entire, often turned edgewise. 

 Flowers autumnal ; disk yellow ; rays white or purplish. (Dedicated to James 

 Bolton, English botanist of the 18th century.) 



* Heads middle-sized, loosely corynibed. 



1. B. asteroides (L.) I/He'r. Stems 0.2-2.5 m. high ; leaves lanceolate; 

 involucral bracts acuminate ; pappus of few or many minute bristles and 2 awns 

 or none. Moist places along streams, Ct. to Neb., arid southw. Aug.-Oct. 

 Var. DECURRENS (T. & G.) Engelm. A large form with the leaves alate-decur- 

 rent upon the stem and branches. (B. decurrens Wood.) 111. and Mo. 



2. B. latisquama Gray. Heads rather larger ; involucral bracts oblong to 

 ovate, obtuse or mucronate-apiculate ; pappus-awns conspicuous. Prairies, etc., 

 w. Mo., Kan., and Okla. 



* * Heads small, panicled on the slender branches. 



3. B. diffusa Ell. Stem diffusely branched ; leaves lance-linear, those on 

 the branchlets very small and awl-shaped ; rays short, mostly white ; pappus of 

 several very short bristles and 2 short awns. Prairies, etc., s. 111. to Fla. and 

 .Tex. Aug.-Oct. 



22. ASTER [Tourn.] L. STARWORT. FROST-FLOWER. ASTER 



Heads many-flowered, radiate ; the ray -flowers in a single series, fertile. 

 Bracts of the involucre more or less imbricated, usually with herbaceous or leaf- 



