BuRRiELfA. COMPOSITE. 379 



branched; scales of the involucre and the oval rays 10-14; achenia fusi- 

 form, compressed-4-sided, or those of the ray obcompressed ; pappus of 4-5, 

 or in the rays 2-3, lanceolate-subulate awns. — DC! -prodr. b. p. 664; 

 Bard. ind. sem. hort. Gcett. 1837, if in Linnepa, 12. suppl. p. 80 ; Hook. S^ 

 Am. hot. Beechey, suiopl. p. 354 ; Hook. hot. mag. t. 3758. B. gracilis & 

 B. longifolia, Nutt. I. c. 



California, Do?/ oZrts/ Nuttall ! — Plant 5-10 inches high, weak, decum- 

 bent. Leaves about 2 inches long, and a line wide, slightly fleshy. Ex- 

 panded heads half an inch or more in diameter. Rays rather longer than 

 the involucre. 



§ 2. Pappus none. — Baekia, Fisch. & Meyer. 



5. B. clirysostoma : appressed-pubescent or hairy ; stems loosely branched ; 

 scales of the involucre and the elliptical rays 10-13, achenia glabrous. — 

 Baeria chrysostoma, Fisch. c^ Meyer! 2nd ind. sem. St. Petersb. {Dec. 

 1835) p. 29^• Don, in Sweet, Brit. ji. gard. ser. 2. t. 395 ,• DC. jnodr. 7. 

 p. 254 ; Hook, t^ Arn. hot. Beec/iey, suppl. p. 354. Burrielia (Amphia- 

 chaenia) hirsula. Nutt. ! I. c. 



California, Fischer S^ Meyer, Douglas! Nuttall! — Plant 6-12 inches 

 high, glabrous below. Leaves li to 3 inches long, 1-2 or 3 lines wide, 

 somewhat channelled above and connate at the base, as in the otjier species. 

 — This and the preceding species are common in cultivation, and resemble 

 each other so closely that they are apparently undistinguishable, except by 

 the absence of the pappus in B. chrysostoma. As similar isomorphous spe- 

 cies occur in Lasthenia, Hymenoxys, &c., we cannot consider the mere 

 absence of the pappus as of generic consequence in this tribe. But 

 since many botanists hold a different opinion, Ave think it inexpedient to in- 

 crease the synonymy by employing the somewhat anterior name of Baeria 

 for the whole genus. 



123. DICHtETA. Nutt. in trans. Amer.phil. sac. {ser. 2.) 7. p. 383. 



Heads many-flowered ; the ray-flowers 5-12, ligulate, pistillate ; those of 

 the disk tubular, perfect. Scales of the somewhat campanulate involucre as 

 many as the rays, nearly equal and in a single series, ovate, scarcely as long 

 as the disk. Receptacle conical, alveolate ; the alveoli toothed. Corolla of 

 the disk with an inflated 5-lobed limb ; the apex of the lobes and the slender 

 tube minutely glandular-hairy. Branches of the style truncate, minutely 

 barbellate at the apex. Achenia attenuate-obconical, 4-angular, somewhat 

 hairy. Pappus of the ray and disk similar, composed of 4-8 oblong nerve- 

 less obtuse chaffy scales, (equalling the tube of the corolla,) which are fim- 

 briate-laciniate at the apex, and 2 (rarely 3 or 4) subulate awns about the 

 length of the corolla. — Annual small (Californian) herbs, growing in wet 

 places and on the margin of ponds, villous-hairy when young, nearly gla- 

 brous when old; with opposite laciniate-pinnatifid leaves, or the upper lin- 

 ear and entire. Heads terminating the stem or branches. Flowers yellow. 



This genus is, as it were, intermediate between Hymenoxys and BiUTJelia ; D. 

 tenella liaving exactly the habit of the latter, and D. uliginosa nearly that of Hy- 

 menoxys (Ptilopsis) mutica ; which, moreover, presents a similar pappus, except that 

 the intermediate awns are wantinfr. 



