COMTOSIT-E. 20-3 



70. Monolopia. Receptacle conical. Scales of the involucre united into a cup or only at 



base- Rays broad. 2-4-lobed, in tke typical species bearing a rounded appendage on 

 the opposite side of the throat. Akenes obovate or oblong, the outer ones obcouipres>cd : 

 the terminal areola small : pappus none. Leaves alternate or rarely opposite, entire or 

 pinnately parted. Woolly plants. 



71. Lasthenia j Hologtmnk. Receptacle conical. Scales of the involucre united almost to 



their tips into a 10 - 15-toothed cup. Akenes linear-oblong : pappus none. Leaves all 

 opposite, entire, sessile and connate at base. Glabrous plant. 



Rays none, the marginal pistillate flowers having short tubular corollas. 



71. Amblyopappns. Head several-flowered. Involucre of 4 to 6 scales. Corollas all very 



sho ' pistillate flowers i - 4-toothed, of the perfect flowers 5-toothed. Akenes 



oblong-cuneate, 4-angled : pappus of blunt scales. 



-;- -;- Receptacle flat : scales of the involucre narrow, chiefly linear. 



■h- Heads with regular ligulate and pistillate rays. 



73. Ama trria Involucre hemispherical, many-flowered, of numerous scales. Tappus none. 



•'es round-cordate, petioled, palmately lobed or toothed, all the lower ones opposite. 



74. Hulsea. Involucre hemispherical, very many-flowered, of very numerous scales. Pappus 



of 4 short thin-hyaline blunt and nerveless scales. Leaves alternate, pinnately lobed or 

 toothed. 



7j. Rigiopappus. Involucre campanulate, rather many-flowered. Rays short and inconspicu- 

 ous. Pappus of i or 5 rigid opaque awn-shaped scales. Leaves alternate, linear, 

 entire. 



Heads destitute of ligulate rays, and homogamous, at least in Calif omian species ; but the 



marginal corollas sometimes enlarged. 



7o. P alafmria Involucre narrow, several-flowered. Lobes or teeth of the corolla narrow. 

 Pappus of hyaline scales traversed by a stout midrib. Roughish herbs or shrubs, with 

 alternate entire narrow leaves, and rose or purple flowers. 



77. Ctuenactis. Involucre caiupanulate or hemispherical. Lobes or teeth of the corolla short 



an.l broad. Pappus of blunt hyaline nerveless or nearly nerveless scales, rarely want- 

 Woolly, viscid-glandular, or nearly smooth herbs, with alternate 1 — 3-pinnateIy 

 parted leaves, and yellow or flesh-colored flowers, the marginal ones commonly enlarged. 

 sties on the receptacle. 



• « Akenes turbinate or obpyraniidal : leaves all or all but the lower alternate. 



+- Scales of the involucre or their tips spreading or reflexed : rays cuneate, 3 - 5 -lobed : pappus 



of hyaline commonly awn-pointed scales. 



78. Gaillardia. Rays neutral. Receptacle with some rigid awns among the flowers. Akenes 



locellate with villous hairs. 

 7 Helenium. Rays commonly fertile. Receptacle wholly naked. 



*- +- Si .des of the involucre erect or appressed : dusk-flowers fertile, their style 2-cleft : akenes 



hirsute or villous. 

 80. Acbnella. Rays 5 to 12, pistillate. I: numerous scales. Receptacle conical or 



rax. Pappus of 5 to 1J hyaline entire scales. 

 SL Syntrichopappus. Rays 5, pistillate. Involucre of 5 concave scales which partly enclose 

 the ray-akenes. Receptacle flat. Pappus of numerous rough bristles, all united at base 

 I 

 ?C Trichoptilium. Rays none. Involucre of about 10 thin and flat scales. Receptacle flat. 

 Pappus of 5 broad hyaline scales, cleft into many slender bristles. 



*-•*-+■ Scales of the involucre not reflexed, united at the base, in a single series : disk-flowers 



Be, their style entire : akenes powdery-papillose. 

 >3. Blennosperma. Says an elliptical or oblong ligule completely sessile on the pyriform 

 akeue. Pappus U"!ie. Leaves pinna:. 



• • • Akenes oblong, flat, surrounded by I OS margin. 



84. Perityle. Involucre campann ppos a 



try one or two awns. Leaves palmately 1 

 or incised, petiolcd ; the I :te. 



IV. T.UJKTIXK.E. Involucre several equal scales in a sing 



with or without some bra< I - also the (glabi . with large 



red rolatjle-oil-gUnds. Hence the 



the type ot the group, common in gardens, probably occurs in was 



