364 COMPOSITE. Helknie/e. 



Div. 2. BALDWiNiEiE. — Receptacle very deeply alveolate ; the corneous alveoli 

 (united chaff"? ) enclosing the achenia. Rays neutral. 



129. Baldwinia. Rays 20-30. Involucre in about 4 series. Alveoli of the 



receptacle truncate. Head solitaiy. 



130. AcTiNospERMUM. Rays 8-10. Involucre in about 2 series. Alveoli of the 



receptacle subulate-toothed. Heads corymbose. 



Div. 3. GalinsogEjE. — Receptacle chaffy ; the chaff" distinct. Scales of the involu- 

 cre not enclosing the ray-achenia. 



131. Marshall: A. Rays none: disk-flowers numerous. Chaff" narrow, rigid. 



Scales of the pappus ovate or triangular-lanceolate, entire. 



132. Blepharipappcs. Rays and disk-flowers few. Chaff" membranaceous. 



Scales of the pappvxs pectinate-plumose. 



Div. 4. MADiEiE. — Receptacle wholly or partly chaffy. Ray achenia destitute of 

 pappus, enclosed by the scales of the involucre. 



* Achenia not compressed, but often obcampressed. 

 +- Heads many-flowered ; the rays infertile "? 



133. Achyrach^-Ma. Pappus of 10 membranaceous obtuse scales in 2 series, the 



inner large. Achenia striate, attenuate at the base. 



+- +■ Heads many-flowered ; the flowers all (or nearly all) fertile. 



134. Layia. Pappus of 10-20 bristly awns, villous-plumose towards the base. 



135. Callichroa. Pappus of 12-25 subulate serrulate-scabrous awns. Disk- 



achenia somewhat obcompressed, villous. 



136. OxYURA. Pappus none. Achenia of the disk and ray glabrous, obovate, 



obcompressed; the central infertile. 



H_ ^_ H_ Heads several-many-flowered ; the disk-flowers infertile. 



137. Hem'zgnl4. .Rays 5-20. Achenia glabrous ; those of the ray obovoid, gib- 



bous, somewhat obcompressed, partly enclosed by the involucral 

 scales. Pappus none, or of lacerate squamellae. 



138. Calycadenia. Rays 3-5. Achenia mostly hairy ; of the ray obovoid-tri- 



angular, partly enclosed by the involucral scales ; of the disk quadran- 

 gular-obcompressed, with a pappus of 5-10 lanceolate or subulate 

 often awned scales. 



139. Lagophylla. P>.ays and disk-flowers each about 5. Achenia glabrous; 



those of the disk abortive, destitute of pappus ; of the ray obcom- 

 pressed. 



* * Achenia compressed, glabrous. Pappus {except in Anisocarpus) none. 



140. Anisocarpus. Rays about 12: disk-flowers numerous, with abortive ova- 



ries, and a pappus of 5-8 fimbriate-lacerate squamellEe. 



141. Madaria. Rays 10-15: disk-flowers numerous, with abortive ovaries. Re- 



ceptacle convex, fimbrillate-hirsute. 



142. Madia. Rays 5-12: disk-flowers numerous, fertile. Receptacle glabrous. 



143. Amida. Rays 1-2, or none; the disk-flowers 2-4, fertile. Achenia com- 



pressed-3-4- angular, slightly incurved. 



144. HarpvEcarpus. Rays 5-8; the disk-flower solitary, fertile. Ray-achenia 



obovate-lunate, flat. 



