252 co.MPosiT.E. (composite family.) 



1. X. Stl'umirium, L. (Common CocKLEnun.) Uoui^h; stems unarmed; 

 leaves diluhd-lriaiKjitlar and more or less heurl-shiijitd, on long petioles, toothed and 

 cut or obscurely lobcd; fruit oval or oblong (i'- §' long), pubescent on the 

 lower part of and between the hooked prickles, and with two strong and usually 

 straight liealcs at the summit. — Barn-yards, &e. (Nat. from Eu.) — Varies into 

 forms with more spotted stems, and often larger fruit (!'- 1' long), which is 

 cither glabrous, glandular, or glandular-hairy, the prickles longer and the beaks 

 often incurved. (X. Canadense, Mill., &c.) — Kiver-banks, &c., common west- 

 ward ; apparently indigenous. And this j)asscs into 



Var. eehinatum. (X. echinatum, Mtirr., &c.) Fruit turgid (I' long), 

 thickly clothed with long prickles, glandular-hispid, the beaks commonly in- 

 curved. — Sandy sea-shore, and along the Great Lakes and rivers. Perhaps 

 an immigrant from farther south. Now widely scattered over the warmer parts 

 of the world. 



2. X. spixosfM, L. (Spiny CLOTBfR.) Honry-pubescent ; stems slender, 

 with sleniler yellow 3-/iarted s/)i>ics at the base of the Iwiaolalc or ovute-kinctolale 

 leaves; these taper into a short petiole, arc white-downy beneath, often 2- 

 .3-lobed or cut; fruit (J' long) pointed with a siny/e short bcaL\ — Waste places 

 on the sea-bo;ird and along rivers, southward. (Nat. from Trop. Amer. ?) 



32. TETRAGONOTHECA, Dill. Tetragonotiieca. 



Heads many-flowered, radiate; the rays G - 9, fertile. Involucre double; the 

 outer of 4 large and leafy ovate scales, which are united below by their margins 

 into a 4-angled or winged cup ; the inner of as many small and chaffy scales as 

 there are ray-flowers, and partly clasping their achenia. Receptacle convex or 

 conical, with narrow and membranaceous chaff between the flowers. Achenia 

 roundish and obovoid, flat at the top. Pai)pus none. — An erect perennial herb, 

 viscidly hairy when young, with opposite and coarsely toothed oval or ol)long 

 leaves, their sessile bases sometimes connate, and large single heads of pale yel- 

 low flowers, on terminal ])cduncles. (Name compounded of TfTpdyui^os, four- 

 am/led, and 6f)Kr], II case, from the shape of the involucre.) 



1. T. heliantholdes, L. — Sandy soil, Virginia and southward. June- 



33. ECLIPTA, L. Eclipta. 



Heads many-flowered, radiate ; the rays short, fertile ; the disk-flowers perfect, 

 4-toothed. Scales of the involucre 10-12, in 2 rows, leaf-like, ovate-lanceolate. 

 Receptacle flat, with almost bristle-form chaff between the flowers. Achenia 

 short, 3-4-sided, or in the disk laterally flattened, roughened on the sides, hairy 

 at the summit ; the pappus none, or an obscure denticulate crown. — Annual 

 or biennial rough herbs, with slender stems and opposite lanceolate or oblong 

 leaves. Heads solitary, small. Flowers whitish : anthers brown. (Name from 

 (K\(i7r(i>, to k' defiilftit, alluding to the absence of pappus.) 



1 E. prOCTlmbenS, Michx. Rough with close appressed hairs; stems 

 procumbent, crec])iiig, or ascending ; leaves oblong-lanceolate, acute at each end, 

 sessile, slightly serrate ; peduncles many times longer than the head. — Var. 

 BRACHTPODA Has the peduncles not more than twice the length of the heads. — 



