62 COMPOSITiE. Xanthisma. 



5-cleft, regular ; the lobes erect. Anthers not caudate. Style of the ray- 

 short and simple, included within the tubular part of the corolla; that of the 

 disk 2-cleft at the summit ; the branches included, linear, obtuse, slightly 

 and minutely hispid. Achenia obovate, scarcely angled, pubescent. Pap- 

 pus composed of elongated unequal acuminate chaff; the outermost rather 

 shorter and narrower. — An annual or biennial erect glabrous herb, with a 

 simple stem, loosely branclied or corymbose at the summit ; the branches 

 erect and leafy. Cauline leaves alternate, rather rigid (not dotted with 

 glands nor fringed with bristles), sessile, oblong or linear, 1-nerved, chiefly 

 entire, sometimes acutely serrate at the summit. Flowers yellow. DC. 



X. Texanum (DC. 1. c.) 



Texas, Berlandier ; in woods. — Habit of Centaurea cerinthefolia. DC. — 

 This plant is wholly unknown to us : it is perhaps from the southern part of 

 Texas, and scarcely within the limits of this work. 



5. PECTIDOFSIS. DC. prodr. 5. p. 98. 



Heads many-flowered ; the flowers of the ray in a single series, ligulate, 

 pistillate ; those of the disk perfect, tubular. Involucre cylindrical-campan- 

 ulate ; the scales about 8, in a single series, somewhat conduplicate. Re- 

 ceptacle naked. Corolla of the disk 5-toothed, regular. Branches of the 

 style semicylindrical, short. Achenia crowned with a very short scarious 

 minutely about 5-toothed and somewhat lacerate pappus. — A very small 

 annual herb, with the habit of Pectis, nearly glabrous, branching from the 

 base. Leaves opposite, narrowly linear, punctate with large pellucid glands, 

 somewhat connate at the base, near which the margins are fringed with a 

 few bristles. Heads on short peduncles terminating the branches. Flowers 

 yellow ; those of the ray 7-8. 



P. angustifolia (DC. 1. c.) — Pectis angustifolia, Torr. ! in ann. lye. New 

 York, 2. f. 214. 



On the Rocky Mountains, in about lat. 41°, Dr. James! — Peduncles much 

 shorter than the leaves. 



6. PECTIS. Linn. (excl. spec.) ; Less, in Linnaa, 6. p. 708, if syn. 

 p. 153. DC. prodr. 5. p. 98. 



Heads several-flowered ; the flowers of the ray in a single series, ligulate, 

 pistillate ; those of the disk perfect, bilabiate. Involucre somewhat cylin- 

 drical ; the scales 5-8, in a single series, often involute or conduplicate. Re- 

 ceptacle naked. Corolla of the disk bilabiate, (the two inner sinuses deeper 

 than the others) ; those of the ray ligulate, the ligule longer than the tube. 

 Branches of the style semicylindrical, short. Achenia striate. Pappus of 

 the disk and ray similar, in a single series, chaffy, mostly pointed with ser- 

 rulate (often unequal) bristles. — Mostly annual (tropical American) herbs. 

 Leaves opposite, connate at the base, 1-nerved, punctate with pellucid 

 glands ; the margin somewhat cartilaginous, and fringed with scattered bris- 

 tles. Heads on slender pedicels, or often sessile. Flowers yellow. 



