106 COMPOSITE. Dickcetophora. 



11. 209, referred (along with a species of Perityle and an Achcetogeroti) to a section 

 of Boltonia. 



D. campestris, GRAY. A small and Daisy-like winter annual, at first acatilescent with a 

 M'.-ipil'orni peduncle (1 to 3 inches high), at length with leafy branches terminated by a slen- 

 der monocephalous peduncle : leaves spatulate, entire, somewhat hirsute : head 2 or 3 lines 

 high, the ovate disk soon surpassing the involucre: rays 16 to 20, apparently white or rose- 

 color. PI. Fendl. 73, perhaps excl. syu. Brachycome? xanthocomotdes, Torr. & Gray, 1 ']. 

 ii. 190, the specimen of which is too young for determination. Southern borders of Texas, 

 Berlandier (no. 1465, specimen too young), Havard, in fruit. (Adj. Mex., Gregg, Palmer.) 



42. BOLTONIA, L'Her. (James Bolton, an English botanical author.) 

 Perennial and leafy-stemmed herbs (wholly of the United States), Aster-like, 

 glabrous, glaucescent, mostly tall ; with striate-angled stems, entire sessile leaves 

 commonly becoming vertical by a twist at base, rarely decurrent ; and with rather 

 showy heads ; the numerous rays white, purplish, or violet ; fl. autumn. Sert. 

 Angl. 27 (with figures cited which were never published,) ; DC. Prodr. v. 301 ; 

 Beuth. & Hook. Gen. ii. 209, excl. Asteromcea, Blume, which passes into Cali- 

 men's, and also 3, which is a mixture. Wings of the akene broadish and thin, 

 narrow and thickish, or obsolete in the same species, or even in the same head. 



* Stems (2 to 7 feet high) paniculately much branched and slender: heads small; the disk only 

 about 2 lines high and wide. 



B. diffusa, ELL. Lower leaves lanceolate ; upper linear, those of the loose and almost fili- 

 form flowering branches or braiichlets becoming linear-subulate and minute: rays mostly 

 white, barely 2 lines long: involucre as in the next, but the bracts more numerous and un- 

 equal. Sk. ii. 400; Hook. Comp. Bot. Mag. i. 97 ; DC. 1. c. & Torr Gray, 1. c., excl. syn. 

 Bot. Mag. Low grounds, South Carolina to Texas and along the Mississippi region north 

 to Illinois. 



* * Stems (2 to 8 feet high) simple and more cymose-panicnlate at summit : leaves broadly lan- 

 ceolate or the uppermost linear-lanceolate: heads short-peduncled, larger; the disk in fruit a 

 third to half an inch in diameter: rays 4 to 6 lines long, 



B. asteroid.es, L'lli:u. Bracts of the involucre lanceolate, acute, mostly greenish: rays 

 from white to purplish or pale violet-color : setulose squamelhie of the pappus mostly nu- 

 merous and conspicuous . the two awns sometimes wanting or obsolete, more commonly 

 present and little shorter than the akene. Matricaria asteroides, L. Maut. 116. M. glasti- 

 fului, Hill, Ilort. Kew. 19, t. 3. Chrysanthemum Carolinmnum, Walt. Car. 204. Bo/tun/n 

 glastifoiia & II. astt roid< s, L'Her. 1. c. ; Michx. Fl. ii. 132 ; Willd. Spec. iii. 2162 ; Sims, Bot. 

 Mag. t. 2381 & 2554; DC. 1. c. Moist or wet ground along streams, Pennsylvania to Illi- 

 nois and Florida. Tbe awnlr-ss form (B. asteroides) is not constant to this character, but 

 is commonly smaller, and with fewer and smaller heads. 



Var. decurreilS, ENGELM. in herb. A large form fin cultivation 7 or 8 feet high), 

 with leaves alate-decurrent on the stem and even the branches ; the wings sometimes ending 

 below in a free and subulate point : pappus-awns slender. Missouri, Eyyert. 



B. latisquama, GRAY. Heads rather larger and more showy rays blue-violet: bracts of 



the involucre oblong to ovate, obtuse or mucronate-apiculate : awns of the pappus uniformly 



present and conspicuous, the setulose squamella; small. Am. Jour. Sci. ser 2, xxxiii 238. 



- Kansas and W. Missouri, near the mouth of the Kansas River, Parry. Now not rare in 



cultivation, the handsomest species. 



Var. OCcidentalis. Heads rather smaller : rays white. River-bottoms of Union 

 Co., Eastern < >regon, Cusick. 



43. TOWNSENDIA, Hook. (David Townsend, botanical associate of 

 Dr. Darlington of Penn.) - - Depressed or low many -stemmed herbs (of the 

 Rocky Mountains) ; with from linear to spatulate entire leaves, and comparatively 

 large heads, resembling those of Aster ; the numerous rays from violet or rose- 



