362 COMPOSITE. Pectis. 



* * Erect and comparatively tall annual, with leaves sparingly if at all setiferous at base: akenes 



all with 2 or 3 corneous and subulate diverging smooth awns (rarely au ascending denticula- 

 tion) : rays small, turning purplish. — Pectidium, DC. 



P. punctata, Jacq. A foot or more high, paniculately branched, very smooth : leaves linear, 

 with copious small oil-glands : heads sleuder-peduucled, quarter-inch long : involucre cylin- 

 drical, few-flowered, of 4 or 5 narrow bracts, involute in age. — Stirp. Amer. t. 128; L. Spec, 

 ed. 2, 1250 ; Griseb. 1. c. P. Unifolia, L. Amocn. Acad. v. 407, & Spec. 1. c, founded on pi. of 

 Browne and Sloane. Pectidium punctatum, Less, iu Linn. vi. 706; DC. 1. c. 98. — S. W. 

 Arizona, Palmer, Smart, Lemrnon. Not yet seen from Florida, where it would rather be 

 expected. (W. Ind., S. Calif., Galapagos.) 



* * * Erect and rather tall perennial, with leaves wholly' destitute of bristles : pappus in some 

 flowers of one or two conspicuous erect and smooth paleaceous awns or rigid aristiform palea', 

 and 2 or 3 rigid squamellte, or sometimes ail reduced to a crown of corneous squamell*, or 

 nearly obsolete: rays conspicuous, turning purplish. 



P. imberbis, Gray. Wholly smooth and glabrous: stems a foot or two high, paniculately 

 branchetl, rather rigid and juuciform, sometimes few-leaved : leaves narrowly linear, quite 

 entire, sparingly punctate with oil-glands : heads half-inch long, slender-pedunculate : invo- 

 lucre cylindrical, of 5 or 6 linear obtuse bracts, with margins strongly involute in age : rays 

 5 : disk-flowers 5 to 7, with lobes of corolla bearing a large dark gland. — PI. Wright, ii. 70; 

 Rothrock iu Wheeler Rep. vi. 172. — S- Arizona, Sanoita Valley, Wright, Rotluock, &c. 

 (Adj. Mex.) 



Tribe VII. ANTHEMIDE.E, p. 77. 



170. LEUCAMPYX, Gray. (AevKdixTrv^, with white head-band; the 

 circle of bracts of the head white-bordered.) — Benth. & Hook. Gen. ii. 422; 

 Porter & Coulter, Fl. Colorad. 77 ; Rothrock in Wheeler Rep. vi. 175, t. 12. — 

 Single species. 



L. Newberryi, Gray in Porter & Coulter, 1. c. Perennial herb, a foot or two high, with 

 the aspect and some of the characters of Ilijmcnopappus (except the rays), flocculent-woolly, 

 glabrate in age: leaves 2-3-pinnately parted into filiform-linear segments: heads few hx 

 several at the naked summit of the stem : involucre nearly half-inch broad : rays three-fourths 

 inch long, obscurely 3-lobed at summit, at first yellow, soon changing to cream-color or white : 

 akenes 2 lines long, turning black. — Canons, &c., S. W. Colorado, Ncivherry, Porter, Bran- 

 degee. Also W. New Mexico, Loew. 



171. ANTHEMIS, L. Chamomile. (Ancient Greek and Latin name 

 of Chamomile.) — Herbs, usually with pinnately dissected leaves, and rather 

 large heads on peduncles terminating the branches ; disk-flowers yellow ; rays 

 white, rarely yellow, fertile, except in the first species. A large Old- World 

 genus, one or two species naturalized. 



A. CoTULA, L. (Mayweed.) Annual weed, of the section Maruta, has receptacle of the 

 head conical, destitute of bracts near the margin, bristly ones at the centre : rays mostly 

 neutral, white, sometimes al)ortive : akenes 10-ribbed, rugose or tulierculate : stem low: 

 leaves finely 3-pinnately dissected : herbage unpleasantly strong-scented, acrid. — Spec. ii. 894 ; 

 Barton, Veg. Mat. :\Ieil. t. 14. Maruta futida, Cass. Diet. xxix. 174. M. Cotula, DC. Prodr. 

 vi. i3. — Common iu waste grounds and along roadsides; fl. late summer and autunm. (Nat. 

 from Eu.) 



A. ARVEXsis, L. (Field Chamomile.) Annual weed, not unpleasantly scented : leaves 1-2- 

 pinnately parted into linear-lanceolate lol)es : heads rather long-peil uncled : bracts of invo- 

 lucre obtuse, whitish scarious : rece])tacle conical ; its bracts lanceolate, acuminate : rays 

 white: akenes with a very short slightly toothed margin in place of pappus. — Engl. Bot. 

 t. 602; Fl. Dan. t. 1179; DC. Prodr. vi. 6. — Old fields, sparingly established iu the Atlantic 

 States, Oregon, &c. (Nat. from. Eu.) 



