BOTANY. 19 



OxTBAPH0S QLABRiFOLius, Va/il, Enum. 2, p. 40 ; var. crassi/olius, 3Ioq. in DC. Prodr. I. c. 

 Santa Barbara; February. Stems numerous, from a woody base (as in 0. angustifolia and in 

 some other North American species). Involucre 1-flowered, 5-cleft ; segments triangular- 

 ovate, acute. Perianth campanulate-rotate. Stamens 5, exaerted. 



Abronia ARENTARiA, 3Ienz. in Hook. Exot. El. t. 193; 3Ioquin in DC. Prodr. 13, pars 2, p. 

 435. San Louis Obispo ; January. 



Abronia mellifera, Dougl. in Hook. Bot. Mag. t. 2879 ; Moq. I. c. On the Gila river and in 

 the California desert ; May to June. 



Polygonum acre, H. B. K.; Gray, Manual ed. 2, p. 373. P. punctatum. Ell. Sk. 1, p. 455. 

 Salinas valley ; November. 



KuMEx MARITIMDS, Linn. Pursh. Fl. \,p. 248; Hook. Fl. Bor. Am. 2, p. 130. Banks of the 

 Salinas river ; November. A common plant in Oregon. 



CnoRiZANTHE (Ptilosepala) FiMBRiATA, iVw^^. in PI. Gumb. (Journ. Acad. Sc. Philad., [n. ser.] 

 l,p. 168.) Torr. in Williamson's Rep. t. 8. San Diego, in sandy soils ; April. 



Chorizanthe (Ptilo^epala) laciniata, (n. sp.): annual, erect ; leaves all spatulate ; scape 

 trichotomously branched ; segments of the involucre about half as long as the tube ; sepals 

 triangular acute, deeply cut into filiform segments. San Felipe ; May. Very much like C. 

 fimbriata, but in the latter the spine-like segments of the involucre are nearly as long as the 

 tube, and the sepals are oblong and obtuse. Both are remarkably prone to separate at the joints 

 of the scape. 



Eriogonum ANfiULOSUM, Bentli. Eriog. in Linn. Trans. 17, p. 406, t. 18, fig. 1. San Filipe ; 

 May. The exterior sepals are nearly orbicular, remarkably concave, and one-half shorter than 

 the interior ones. All of them glandularly ciliolate on the margin. Ovary and achenium 

 glabrous. Embryo curved, with a long radicle. Allied to E. Abertianum, Torr. 



Eriogonum TRICHOPODUM, Torr . in Emory' s Eeport, p. 150 (incorrectly E. trichopes) ; Benth. 

 in D. C. Prodr. 14, pars l,p. 20. Sauz valley; August. The leaves are in a radical cluster, 

 roundish-ovatCj very obtuse, mostly cordate, entire or obscurely repand, somewhat hairy on botli 

 sides ; the petioles are nearly twice as long as the lamina. Peduncles capillary, 4-8 lines long, 

 spreading horizontally, or somewhat refracted. Involucre turbinate-infundibuliform, obtusely 

 4-toothed, about 5-flowered. Bracteoles linear-spatulate, shorter than the pedicel. Achenium 

 triquetrous, glabrous. This species is rather common on the Grila and lower Colorado. The 

 specimens collected by Dr. Antisell are nearly two feet high. 



Eriogonum nudum, Dougl.; Benth. I. c. Plentiful on the head-waters of San Antonio river, 

 California ; December. 



Eriogonum polifolium, Benth. in herb Torr., and hi DC. Prodr. 14, (ined.) San Louis Key 

 to San Diego ; also in Santa Clara valley ; February to April. A low shrubby species near E. 

 fasciculatum. It is variable in pubescence, being sometimes almost smooth. 



CENTEOSTEGIA, Gray, Nov. Gen. 



" Involucrum papyraceum, (demum coriaceum,) 1-2 florum, tubulosum, venosum, apice inequa- 

 liter 5-dentatum ; dentibus mucronato-aristulatis, basim juxta tricalcaratum, calcaribus magnis, 

 divaricatis, breviter subulato-aristatis. Perignnium 6-partitium, petaloideum ; laciniis tenuibus, 

 lineari-spathulatis, ungue hirsutulo. Stamina 9. Ovarium trigonura ; styli 3, graciles ; stig- 

 matibus capitatis. Achenium triquetrum. Embryo curvatum. Herba annua, demissa, glabra, 

 a basi ramosa ; ramis diffusis, floriferis flexuosis ; foliis radicalibus spathulatis ; ramealibus 



