496 COMPOSITE. (COMPOSITE FAMILY.) 



16. IPHIOiSrA. ^ Erinaceous shrubs with needle-like, pinnatipartite leaves. 



17. YAETHEMIA. ^ Unarmed, much branched shrubs, with small, discoid heads. 



18. PULICAEIA. 2^ Unarmed herbs, with .01 to .025 broad, showy, radiate heads. 



19. FKANCCEURIA. ^ Unarmed, desert shrubs, with aspect of Pulicaria undulata, but 



with .005 broad heads. 



SuBTRiBE YI. BL'PHTHAIiME^. Heads various. Flowerets fertile or the 

 marginal ones sometimes sterile. Eeceptacle chaffy or bristly. Branches of style obtuse. 



* Involucre at length nearly globular, indurated. Flowers yellow. 



20. GYMNAERHENA. Stemless or nearly stemless, desert herbs, with heads crowded 



above the neck. 



21. ANYILL^A. -5 Branching shrubs, with aspect of Asteriscus graveolens. 



* * Involucre hemispherical, outer rows of scales herbaceoits. Flowers yellow. 



22. ASTERISCUS. © 2X Unarmed herbs with .OS to .03 broad, radiate heads. 



23. PALLENIS. Herbs with aspect of Asteriscus, but the tips of scales spiny. 



24. CHEYSOPHTHALMUM. 2f Unarmed herbs, with .01 broad, discoid heads. 



25. P08TIA. -5 Woolly herbs, with shrubby base, and .006 to .02 broad, radiate or discoid 



heads. 



Tribe IY. AMBROSIEJE, Monoecious. Stamiiiate heads many-flowered, pistil- 

 late 1-2-flowered. Anthers nearly free, somewhat curved at tip. Siyle of sterile flowerets 

 undivided, of fertile 2-cleft into filiform branches. Akenes bald, enclosed in the hardened 

 involucre. 



26. AJaBEOSIA. Maritime herbs, with terminal spikes of minute heads, the lower pistil- 



late, the upper staminate. 



27. TvANTHTTTM. Herbs growing in waste places, with solitary or racemed, sessile, 



prickly, ovoid heads. 



Tribe Y. HELilANTHE^E. Heads heterogamous or homogamous. Anthers not 

 caudate at base. Branches of style truncate or with short appendages. Eeceptacle chafiy. 

 Pappus beard-like or 0. Leaves opposite. 



28. EcLiPTA. Rays white. Leaves nearly entire. 



29. BIDENS. Heads discoid or white-rayed. Leaves tripartite. 



Tribe YI. ANTHEMIDE.SI. Heads heterogamous or homogamous. Anthers 

 without appendages. Branches of style truncate at tip. Pappus crown-like or chaffy, never 

 bristly or hairy, sometimes 0. 



SuBTRiBE I. EUANTHEMIUE^. Eeceptacle chaffy. 



30. ANACYCLUS. Eays white or yellow. Leaves 1-2-pinnatiparted. Akenes flattened, 



with a pellucid auricle in place of pappus. 



31. ACHILLEA. 2f 5 ^"-^y^ white or yellow or 0. Leaves undivided, or narrow, 



with imbricated, transverse lobes, or dissected. Akenes compressed. 



32. DIOTIS. 2^ White-woolly, maritime herbs, with entire or crenulate, ovate or oblong 



leaves, and discoid, yellow flowers. 



33. ANTHEMIS. 2|! K^ys usually white (.4. Scariosa yellow). Leaves (excepts. 



leucanthemifolia) dissected or pinnatifid. Akenes angled. 



34. CHAM.^MELUM. 2f Heads discoid or radiate, rays white. Leaves dissected. 



Akenes obpyramidal or somewhat compressed, 3-ribbed at inner 

 face. 



35. OEMENIS, Eesembles Anthemis, but the corolla-tube 2-winged, 2-spurred at the 



base in the rays, and winged at base in the disk -flowerets, and produced 

 into an oblong-lanceolate horn enclosing the akenes. 



