;>()(; COMPOSITvE. Pcrilyk. 



Moist giouml, from San Francisco Bay to San Diego. Scales of the involucre sometimes tippeil 

 witli iturpie. lliiys 2 or 3 lines long. Tlie minute papillie on tlie ukene, as seen under the 

 niicroscojie, swell up when wetted, open at the e.vtruinity or split into two valves, and emit two 

 long tilaments of e.xtrenie tenuity, tiie whole apparently forming a gelatinous mass enveloping the 

 ukene ; just iis occurs in Crdcidiuin and in .some s})ecie3 of ScMciu, &c. From this peculiarity it 

 took its generic name, whicli means "luucilagiuuus mieJ." 



tMiociiiiUM MiM.TK'Aiii.i;, Hook., is a Hmull plant riistunlillng Jlli'iini>sprnna, l)\il with a fuga- 

 cious capillary jjajipus. It is common along the coast, of Oregon, hut has not been iletcctcd in 

 California ; the specimen so nanidl in the Botany of the Mexican Boundary, collected by Dr. 

 Stillman, proving to bo iilciuwsjKrma. See Proc. Am. Acad. ix. 206. 



84. PERITYLB, Bentb. 

 Tlofttl muny-lK>\voiT(l, witli iiistillato mys or occuaiuimlly none ; tho llowera all 

 fertile. Involucre cuinpamilaLe, of nearly etjual scales, slightly carinate on the 

 back, in a single or double series. Keceptacle llattish or conical, naked. Riys 3- 

 toothed : disk-corollas 4-toothed ; the tube glandular. Style-branches tipped with 

 (or insensibly changing into) a short and obtuse or more commonly subulate or 

 iiliform, hairy appendage. Akenes oblong, flat (laterally compressed), dark-colored, 

 bordered by a cartilaginous mostly ciliate-bearded margin. Pappus a series of 

 hyali)ie or setiform scales, usually nmre or less united into a cup or crown, and 

 commonly a slender awn from one or both margins. — Low annuals or j)erennials, 

 of tho southern j)art of California and adjacent regions ; with petioled usually 

 palmately-lobed or incised and membranaceous leaves, at least the lower ones oppo- 

 site, and pedunculate rather small heads terminating corymbose or paniculate 

 bi-anches (rarely in a corymbose cyme). Kays white (or sometimes yellow 1) : disk- 

 llovvers yellow. — lienth. Bot. ^\\\\A\. 23, t. 15, & Gen. PI. ii. 398; Cray, Proc. 

 Am. Acad. ix. 194. 



In our view, as stated in tho paper above cited, tho crown of pa]ipu8 furnishes a better charactor 

 than tho slyUi-apjM!ii(higis, m anytliinif in tin- involucre, to distuiguish this genus from Lap- 

 /laiiiia, Olio species of which also has short and blunt stylo-appendages. Luphamm nearly takes 

 the 2>ltiee of J^critijlc eastward, and one species of it inhabits tlie soutliern part of Nevada. 



P. INCANA, Gray, Proc. Am. Acad, ined., recently discovered on Guadalupe Island, Lower 

 California, is aii anomalous sj)ecies, stout and somewhat frutescent, as white-woolly as Scnecio 

 Cineraria, and with numerous layless heads in a ciowded and naked pedunculate corymb. 



1. P. Californica, Benth. Pubescent or glabrate : l<;aves mostly opposite, 

 broadly ovate or deltoid, incisely toothed or somewhat lobed : rays oblong, perliaps 

 yellow : style-appendages short and obtuse : akenes hispid-ciliate : the outermost 

 obovate and with mucli thickened corky-cartilaginous margins, the inner obovate- 

 oblong and with nerve-like margins, narrowed at the top : awns of the pa[>pus one 

 or two, scabrous. 



Probably only in Lower California; Bay of Magdalena, Hinds; Cape San Lucas, Xantics. 

 Heads 3 or 4 lines long. Throat, i. e. the expanded upper part, of the disk-corolla, rather shorter 

 than its tube. Peccptacle almost fiat. 



2. P. plumigera, Cray. Clandular-puberulent above, the base of stem un- 

 known : leaves of the brunches ovate or oblong, small, toothed : heads smaller than 

 in the foregoing: rays oblong, apparently white : style-appendages short and obtuse: 

 akenes oblong, not contracted at the apex, very densely villous-ciliate : awn of the 

 pappus only one, nearly equalling the corolla, sparsely liispid-plumose above. — I'l. 

 Fendl. 77. 



California, Cotdler. Probably from the southeastern borders of the State or adjacent portion 

 of Arizona. Receptacle strongly convex. 



3. P. Acmella, Cray, 1. c. Puberulent and somewhat glandular : lower leaves 

 opposite, ovate and deeply 3-cleft ; the upper alternate and somewhat hastately 



