248 COMPOSITE. (CO.MPOSITE FAMILY.) 



natifid ; scales of the involucre cuspidate, viscid, not wcbhy ; flowers purple. — 

 Pine-barren swamps, Florida, Gcorj:ia, and westward. July and Aui;. — Stem 

 2° - 3° high, rigid. Heads 1' in diameter. 



8. C. repandum, Michx. Webby throughout when young ; stem simple, 

 very leafy ; leaves ol)long-linear, clasping, the margins undulate and closely 

 fringed with bristly spines ; heads mostly solitary ; flowers puqde. — Dry piue 

 barrens, Florida to North Carolina. June and July. — Stem 1° - 2° high. 



9. C. horridulum, Michx. Webby when young, at length smoothish ; 

 stem thick, branching; leaves clasping, pinnatifid, armed with long and stout 

 spines ; heads large, surrounded by a whorl of linear pectinate spiny bracts ; 

 scales of the involucre linear-subulate, spine-pointed ; flowers purple or yellow- 

 ish. — Sandy soil, Florida, and northward. April and May. — Stem l°-3° 

 high, often purple. 



79. LAPPA, Tourn. Burdock. 



Heads many-flowered, discoid ; the flowers all perfect and similar. Scales of 

 the globose involucre imbricated, coriaceous, witli subulate spreading hooked 

 tips. Rccej)tacle flat, bristly. Achenia oblong, compressed, transversely rugose. 

 Pappus of numerous short caducous bristles. Anthers caudate at the base. — 

 Biennial branching herbs, with large cordate petioled leaves. Heads small. 

 Flowers purple or white. 



1. L. major, Goert. Leaves undulate on the margins, pubescent beneath; 

 the uppermost ovate ; heads corymbose ; involucre smooth or webby. — Waste 

 places, North Carolina. Introduced from Europe. 



Suborder II. L.ABIATIFL0R^. 



Tribe VI. MUTISIACE-^^. Heads irilh the JJoivers dissimilar or rarely dice- 

 cious ; the viarginal ones pistillate or neutral, litjidate or bilabiate : style as in 

 Tribe V. 



80. CHAPTALIA, Vent. 



Heads many-flowered, radiate. Ray-flowers pistillate, in two rows, the outer 

 ones ligulate, the inner ones ligulate or 3- ."j-toothed and filiform. Disk-flowers 

 perfect l)Ut sterile, bilabiate, tlie outer lip 3-cIcft, the inner 2-cleft. Anthers cau- 

 date. Scales of the cylindrical invohicre lanceolate, acute, indiricatcd in few 

 rows. Receptacle naked. Fertile achenia oblong, smooth, narrowed at eacli end. 

 Pappus of numerous bristly hairs. — Stcinlcss ])crcnnial herbs; the simple scape 

 bearing a single head of white or j)urplish flowers. Leaves smooth above, white 

 tomcntosc beneath. 



1. C. tomentosa, Vent. — Low pine barrens, Florida to North Cmolina. 

 Feb.- April. — S(n]ii' toinentose, C - 12' high. Leaves Bpatulate-lunccohitc or 

 oblong. Heads nodding. 



