224 - COMPOSITE FAMILY. 



IS. BACCHAHIS. Corolla of the pistillate flowers very slender and thread-like; of the 

 staminate flowers, larger and 5-lobed. Anthers tailless. Akenes ribbed. Pappus 

 in the fertile flower long and abundant ; in tlie staminate, scanty and tortuous. 

 Smooth or glutinous herbs near the coast. 



II II Flowers perfect. 



24. HELIPTEKUM. Flowers wth open 5-toothed yellowish corollas. Involucre (silvery 

 rose-colored), smooth obovate, or top-shaped. Akenes woolly ; pappus of numerous 

 plumose bristles. Leaves and stems smooth and naked. 



26. AM.MOBIUM. Flowers with yellow 5-lobed corollas, surrounded by a silvery-white 



involucre. Chaffy scales on the receptacle among the flowers. .Vkenes rtattish-4- 

 sided ; pappus of 4 teeth, 2 of them prolonged into a bristle. Leaves and stems 

 white-cottony, the latter with leaf-like wings. 



(52) CHRYSANTHEMUAL One species is sometimes rayless, and with flowers all alike 

 from the suppression of the ligulate pistillate ray flowers (p. 226). 



= -= Scales of the involucre not dry and scarious or papery {i.e., they irilt) ; floirers 

 all perfect. 



1 Flowers yellow, with chaff between them; akenes flat, bearing 2—1 awns or bristles. 



(43, 44) COREOPSIS and BIDENS (p. 227). A few species have no ray flowers. 



II II Flowers yellow, no chaff; akenes not flat ; pappus of copious, very soft and fine, 

 down-like bristles. 



(57) SENECIO. One or two species are destitute of ray flowers (p. 225) ; also (11) SOLI- 

 DAGO (p. 225). ,, II II pioj^grs not yellow ; no chaff. 



59. EMILIA. Heads rather smaU, but with many orange-red disk flowers in a very 



simple cup-shaped involucre with no small outer scales. Akenes with 5 acute and 

 hispid-ciliate angles. Very closely related to Senecio (p. 225). 



60. CACALIA. Heads corymbed, wth 6-30 white or whitish flowers. Scales of the in- 



volucre a single row, with a few small bractlets at base. Corolla 5-cleft. Branches 

 of the style smooth, with a conical or flat usually minutely hairy tip. Akenes 

 oblong, smooth; papjius of veiy many ttnc and soft, down-like, naked bristles. 

 Leaves alternate. 



(12) BELLIS. A cultivated state witli quilled unonstrous) flowers may be sought liere 

 (p. 225^, 



B. With strap shaped corollas or rayx at the margin of the head. {Discoid variations 

 may occur.) 



* Herbage, inrohicres. etc.. dotted with large pellucid or colored glands or oil recep- 

 tacles imbedded in. their substance, making the plants strong-scented : involucre 

 of one row of scales united into a bell shaped or cylindrical cup; no chaff on 

 theflattish receptacle; floioers yelloiv or orange. 



48. DYSODIA. Kays pistillate, mostly short. Involucre with some loose bractlets at the 



base. Receptacle not chafly, but clothed with short chafiy bristles. Akenes slen- 

 der, 4-angled ; pappus a row of chaffy scales dissected into numerous rough bristles, 

 so as to appear at first sight as if capillary. Leaves opposite. 



49. TAGETES. Rays pistfllate. Involucre wthout bractlets at b.ise. Akenes elongated, 



flat, somewhat 4-sided ; pappus of two or more unequal rigid chaffy scales, often 



united into a tube or cup, sometimes tapering into awns. Herbs, very glabrous. 



» * Herbage not spotted with large translucent or colored, strong-scented glands. 



■*- Pappus of copious hair-like bristles ; no chaff on the receptacle among the flowers. 



•»<• Mays yellow, except in one or two species of Senecio and one Solidngo, pistillate. 



= Anthers caudate or appendaged at the base. 



27. INULA. Ray flowers very numerous in one row, with narrow ligules. Outer scales 



of the involucre leaf-like. Pappus of many slender roughish bristles. Akenes 

 narrow. Heads large and broad, the tubular perfect flowers very numerous, their 

 antlicrs with twn tails at the Iiase. Leaves alternate. 



