306 COMPOSITE. Monoptilon. 



obovate, or some of them perhaps rather triangular, obscurely few-nerved, hairy. Forms without 

 pappus, or with more or less reduced bristles, grow mingled with the normal state. The rayless 

 variety has been collected at Auburn, Russian River, San Lorenzo Valley, &c., and a very 

 dej^auperate state about San Francisco. But the state with ray-corollas reduced to a tube, on 

 which Aplumtoehcela was founded, has as yet been detected only in Dr. J. M. Bigelow's specimens, 

 from Napa Valley. Near Vallejo a form was collected by llcv, E. L. Greene with well-developed 

 rays pure white, except a pale yellow base. 



11. MONOPTILON, Ton. & Gray. 



Head many-flowered, lieterogamous ; the rays numerous in a single series, fertile. 

 Involucre of numerous narrow equal thin scales, almost in a single rank. Recep- 

 tacle barely convex, naked. Corollas with rather hairy tube ; the white or purple 

 ligules oblong-obovate. Branches of the style tipped with a short obtuse appendage. 

 Akenes oblong-obovate, compressed, one- nerved on each margin, or in the ray with 

 a lateral nerve also. Pappus double ; the outer a minute almost entire crown ; 

 the inner a deciduous bristle which nearly equals the disk-corolla, scabrous below 

 and plumose for some distance from the summit downward. — Jour. Bost. Nat. 

 Hist. Soc. v. 106, t. 13. Only one species : — 



1. M. bellidiforme, Torr. & Gray, 1. c. A delicate Daisy-like little annual, 

 / Vv- spreading on the ground, an inch or two high, villous-pubescent : leaves alternate, 

 narrowly spatulate, entire : heads scattered, hardly peduncled, barely half an inch 

 ' in diameter, including the white and purplish-tipped or pink-purjjle rays : disk- 

 flowers yellow. 



On the Mohave desert or between California and the southwestern part of Utah, where a single 

 specimen was collected by Fremont. Recently rediscovered in the latter region by Parry. 



12. EREMIASTRUM, Gray. 



Head many-flowered, lieterogamous ; the white rays numerous in a single series, 

 fertile. Involucre campamdate, of nearly equal narrow scales, the outermost nearly 

 foliaceous. Beceptacle flattish, naked. Ligules oblong, entire. Brandies of the 

 style tipped with a lanceolate appendage. Akenes obovate-oblong, flat, one-nerved 

 on each margin. Pappus of two sorts, i. e. the outer of 8 or 10 thin laciniately dis- 

 sected scales, each apparently composed of several united bristles ; the inner of 

 about as many stout bristles or awns, and some smaller ones intervening. ■ — Gray, 

 PL Thurb. (Mem. Am. Acad, v.) 320. — A single species : — 



1 . E. bellioides, Gray, 1. c. — A low, Daisy-like, hirsute or hispid annual, 1 to 

 4 inches high, and sending off procumbent branches ; resembling Monoptilon but 

 larger : leaves alternate, narrowly spatulate, entire, disposed to be crowded under 

 the terminal solitary heads, and passing into scales of the involucre : head (includ- 

 ing the expanded white rays) about two thirds of an inch in diameter, handsome ; 

 the disk yellow. 



Dry plains on the Colorado and Mohave Rivers, Tliurber, Sclwtt, Newberry, Cooper, &c. Also 

 Southern Utah, Parry. 



13. LESSINGIA, Cham. 



Head 5 - 25-flowered ; the flowers all perfect, with limb of the corolla regularly 

 or sometimes obliquely parted down to the slender tube into 5 linear lobes, or the 

 marginal ones with the enlarged limb palmately parted into a kind of ray, in these 

 the stamens often abortive. Involucre campanulate or turbinate ; its scales imbri- 

 cated, appressed, and mostly with herbaceous often spreading tips. Eeceptacle flat, 



