CAEDUACEAE. 



145 



2. A. hispida Pursh. Perennial, the stem and branches decumbent or prostrate, 

 the younger parts hirsute: leaf -blades short-hirsute, the ultimate segments 

 small, short and rounded: peduncles stout, minutely hirsute: staminate invo- 

 lucres finely hirsute: achenes 4-4.5 mm. long. Coastal sand-dunes, II. 8. keys, 

 U. keys, L. keys, L. S. keys. [E. K.] (Bah., Cuba, Ant.) 



3. IVA L. Leaf -blades entire or toothed. Mature pistillate involucre not 

 bur-like. 



1. I. imbricata Walt. Stems 3-7 dm. long, smooth and glabrous: leaf -blades 

 linear-subulate to linear, 2-5 cm. long, glabrous: involucre 3-4 mm. high: 

 achenes about 3-3.5 mm. long. Coastal sand-dunes and rocky shores, U. S. 

 keys, TJ. keys, L. keys, L. S. keys. [E. K.] (Bah., Cuba.) MARSH-ELDER. 



middle. 

 TRIBB I. 

 TEIBB II. 



VERNONIEAE. 

 EUPATORIEAE. 



FAMILY 2. CARDUACEAE. THISTLE FAMILY. 



Herbs or rarely shrubs or trees. Flowers borne in heads, the marginal 

 ones commonly differing from the central ones in having a 1-sided, more 

 or less elongate corolla limb. Pappus usually present and often con- 

 spicuous. 



Stigmatic lines at the base of the stigma or below the 

 Stigmas filiform or subulate, htspidulous. 

 Stigma more or less clavate, papillose-puberulent. 

 Stigmatic lines extending to the tip of the stigma or 



to the appendages. 



Anthers without elongated appendages at the top. 

 Anther-sacs tailed at the base. 

 Anther-sacs not tailed at the base. 

 Receptacle naked. 



Bracts of the involucre well imbricated. 

 Stigmas of the perfect flowers with 



terminal appendages. 

 Stigmas of the perfect flowers with 

 truncate or hairy or papillose tips. 

 Bracts of the involucre little if at all 

 imbricated, except when the broad 

 outer ones overlap the inner. 

 Receptacle chaffy. 



Anthers with elongated, cartilaginous, mostly 

 connate appendages at the top. 



TRIBH IV. INTJLEAE. 



TEIBH 

 TRIBH 



TRIBH VII. 

 TRIBB V. 



ASTEREAE. 

 HELENIEAE. 



SENECIONEAE. 

 HELIANTHEAE. 



TRIBH VIII. CYNAREAE. 



TRIBB I. VERNONIEAE. 



Pappus of 2 series : corollas regular : heads neither glomerate nor involucrate. 



1. VERXONIA. 



TRIBB II. EUPATORIEAE. 



Achenes 3-5-angled, ribless. 



Pappus various, never wholly of capillary bristles. 2. AGERATUM. 

 Pappus wholly of capillary bristles. 



Involucre of more than 4 bracts, 5-many-flowered. 3. OSMIA. 



Involucre of 4 bracts, or rarely of more, 4-flowered. 4. MIKANIA. 



Achenes 8-10-ribbed or 8-10-striate. 5. LACINIARIA. 



TRIBB III. ASTEREAE. 

 Ray-flowers present, or rarely wanting: plants not 



dioecious. 

 Ray-flowers with yellow corollas. 



Pappus, at least that of the disk flowers, of dif- 

 ferent series, the inner of capillary bristles, the 

 outer of scales or of shorter bristles. 

 Pappus wholly of capillary bristles. 

 Ray-flowers with white or colored (not yellow) 



corollas. 



Bracts of the involucre in 3-many series. 

 Bracts of the involucre in 1 or 2 series. 

 Ray-flowers wanting: plants dioecious. 

 s Flora of Florida Keys 10. 



6. CHRYSOPSIS. 



7. SOLIDAGO. 



8. ASTER. 



9. LEPTILON. 

 10. BACCHARIS. 



