324 COMPOSITE MICROPUS 



ceous. Receptacle naked. Tall herbs. 



82 INULA Heads heterogamous, radiate, with all the flowers fertile : pap- 

 pus of capillary bristles. 



SUBTRIBE iv ADENOCAULE^E Bracts of the involucre herbaceous, 

 few, in a single series. Receptacle not chaffy. Heads few-flowered : 

 both pistillate and hermaphrodite sterile flowers with similar di- 

 lated tubular corollas, the former rather fewer and with enlarged 

 exsertsd achenes 



38 Adenocanlon Achenes club-shaped and several times longer than the 

 involucre, beset with some stipitate glands: pappus none. 



SUBTRIBE v DIMERESE^E Bracts of the involucre herbaceous, 

 few, in a single series. Receptacle not chaffy. Flowers few, her- 

 maphrodite, fertile. Pappus of rather few bristles. 



34 Dimeresia Heads 2- flowered : involucre of 2 slightly united bracts, 

 each almost enclosing a flower : pappus of 20 slightly united bristles 

 that are early deciduous. 



Subtribe 1 Filaginess Fenzl Fl. ii 729. Heads h'terogamous, 

 mostly androgynous, discoid. Involucre of few scarious or firmer 

 bracts Receptacle chaffy, a chaff or involucral bract enclosing or 

 sudtending each pistillate flower or achene. Corolla of the pistillate 

 Howers a filiform tube, shorter than the style; of the hermaphrodite 

 commonly s'e rile flowers regularly 4'lo^thed; their anthers sometimes 

 only acutely sagittate or auriculate at base, and the short style-bran- 

 ches or undivided stvl* not truncate. Achenes mostly smooth and 

 even, small and seed-like, the very thin pericarp destitute of nerves 

 .or other markings. 



25 MICROPUS Gaertn. Fr. t. 164. 



Low floccose-woolly annuals with entire leaves and small 

 heads of inconspicuous flowers in sessile clusters. Heads discoid, 

 several- flowered ; the pistillate flowers with filiform corolla forming 

 a single series, each wholly enclosed in a conduplicate infolded 

 and laterally compressed very gibbous chaff or scale, which be- 

 comes firm-coriaceous or cartilaginous in fruit, and falls at ma- 

 turity with the completely enclosed achene, inclined at length to 

 dehisce into two valves; the hermaphrodite but sterile flowers 

 with 4 5-toothed tubular corolla few and naked in the centre. 

 Involucre of few scarious bracts. Receptacle small and short. 

 Achenes obovate and gibbous laterally compressed, smooth, its 

 apex lateral. Pappus wanting. 



M. Calif or niens F. & M. Ind. sem. Petrop 1835, 42. Stems slender, 

 4-16 inches high, loosely white-woolly, simple or sparingly branched above, 

 leafy to the top: leaves linear -oblong to oblong-lanceolate, entire, 6-8 lines 

 long, densely tomentose with a fine somewhat silky white wool, the largest 

 near the centre of the stem : heads in lateral and terminal clusters which 

 are inclined to be spicate : fructiferous scales very woolly, under the wool 

 smooth, half-obcordate, with a suberect beak terminating in a somewhat 

 dilated scarious apex. Common on dry open hillsides, southwestern Ore- 



