COMFOSITAE (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, E. 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. integrif6lia Michx. (WESTERN D.) Annual or biennial, diffusely 

 branched, 1-4 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. 



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 annuals, with narrow entire leaves and solitary terminal heads ; rays 

 white or purple. (Xa/rij, a bristle, and wdwiros, 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. BOLT6NIA L'He"r. 



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 corymbed. 



1. B. asteroides (L.) T/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., and 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- 



