422 COMPOSITE, Perezia. 



Tribe X. MUTISIACE.E. 



These are Bilahiatijlorce, i. e. liave their corollas bilabiate, one lip mostly 3- 

 toothed, the other 2-lobed or cleft, the lobes or lips revolute. As the flowers are 

 more commonly all perfect, and the style similar, they may be confounded with the 

 Thistle-tribe, in which the corolla is often more or less two-lipped or irregidar. But 

 the lobes of the latter become revolute in the present tribe, and the receptacle is 

 never clothed with a coat of bristles. — The tribe is most largely represented in 

 South America ; only one genus reaches California. 



107. PEREZIA, Lagasca. 

 Head several - many-flowered ; the flowers all perfect. Involucre turbinate or 

 campanulate ; its scales imbricated, lanceolate or oblong, mostly chartaceous. Eecep- 

 tacle flat and naked. Corolla with slender tube and bilabiate limb ; the outer lip 

 mostly longer and 3-toothed ; the inner 2-toothed or 2-cleft. Anthers with long 

 naked tails at base, and a lanceolate terminal appendage. Akenes elongated-oblong, 

 terete or slightly angled, often obscurely narrowed at apex, commonly glandular. 

 Pappus of copious scabrous capillary bristles. — Herbs ; with alternate and mostly 

 rigid leaves, and soMtary or usually paniculate heads of purple or white flowers. — 

 Gray, PI. Fendl. & PI. Wright. ; Benth. & Hook. Gen. PI. ii. 500. 



A genus of 40 or 50 species, South American and Mexican, and a few witliin the borders of the 

 United States. 



1. P. microcephala, Gray, 1. c. Two or three feet high, branched and glan- 

 dular-puberulent above, leafy to the top : leaves thin, oblong and the upper ovate, 

 all cordate-clasping, with the sinus shallow, minutely glandular-scabrous, coarsely 

 reticulate-veiny, closely spinulose-denticulate : heads copious, corymbose at the 

 summit of the paniculate branches : scales of the involucre all abruptly very acute, 

 puberulent-glandular ; the innermost a little shorter than the 10 to 15 rose-purple 

 flowers. — Acourtia microcephala, DC. Prodr. vii. 66. 



Near Monterey {Douglas), Santa Barbara (Torrci/), and San Diego Co., T). Chnjlirnd, Palmo.r. 

 Involucre 3 or 4 or at length 5 lines high : pappus at maturity half an inch long. In the speci- 

 mens of Douglas, described by De Candolle, the flowers are immature. 



2. P. Arizonica, Gray. A foot or two high, almost glabrous : leaves more 

 deeply cordalely or sagittately clasping : heads fewer and rather smaller, in 

 cyraose corymbs : scales of the involucre obtuse, pubescent on the edges, otherwise 

 glabrous and not glandular; the innermost only half the length of the 8 to 12 

 white or flesh-colored flowers. — P. microcephala, Gray in coll. Parry, No. 141, 

 Am. Xat. ix. 273. 



Arizona, Dr. Palmer. S. Utah, Dr. Parry. Probably also Xo. 293 of California collection, 

 Coulter. Palmer's plant is said to exhale " an agreeable aroma. " 



Tribe XL CICHORIACE.E. 



Completely marked by the ligulate and perfect flowers throughout the head : the 



ligules almost always 5-toothed at the apex. Herbs, with a bitter milky juice. 



Lettuce, Endive (a variety of the Cichory), and Salsify {Tracjopogon porrifolius, which is apt to 

 run wild around cultivated grounds), are the common cultivated esculent plants of the tribe, all 

 of the Old World. The tiibe con.sists of 50 or 60 genera, even as consolidated by Bentham in the 

 new Genera Plantarum, and is fairly well represented in California. It is so strictly natural that 

 it is difficult to divide it into well-limited natural subtribes or into genera. 



