132 BOTANY. 
ERIOGONUM LACHNOGYNUM, Torr. mss.; Benth. l. c. p. 8. (Tab. XIX.) Hill-sides and rocky 
dells of the Llano Retachdó : ; September: A remarkable species. At the base of each flower 
there is an ovate-lanceolate bract, (not represented in the figure,) and inside this a pair of 
spatulate-linear opposite Battle, This appears to be the normal structure in the genus, but 
we have not detected it in any other species. Usually the bracteoles are solitary, or more rarely, 
a pair of opposite ones to each flower. 
卫 RIOGONUM WRIGHTII, Torr. Mss.; Benth. l.c. p. 15. Gravelly plains, near Albuquerque, 
New Mexico; October. Stem suffruticose, decumbent, throwing up erect branches which are 
6-12 inches high. Flowers very numerous, many of them expanding together, and thus form- 
ing heads which are more than half an inch in diameter. Involucre acutely 5-toothed. Seg- 
ments of the perianth obovate, the exterior a little broader than the others; ovary and achenium 
with the beak hispid. 
ËERIoGONUM JAMESII, Benth. in DC. Prodr. 14, pars 1, p. T. Hills on the upper waters of 
the Canadian River. September. 
卫 RIOGONUM TENELLUM, Torr. Ann. Lyc. N. York, 2, p. 241; Benth. l. c. p. 19. With the 
last; in rocky places. 
ERIOGONUM ROTUNDIFOLIUM, Benth. 1. c. p. 21. Sandia mountains, New Mexico; October. 
Bracteoles 2, spatulate-linear, glandular on the margin, and fringed also with long Kiise 
eegen EFFUSUM, var. LEPTOPHYLLUM, Torr. in Sitgreaves’ Hep. p. 168. Hills and ravines, 
Cienegella, New Mexiso ; October. 
ERI0GONUM EFFUSUM, vat. P NUDICAULE: caule brevissimo ramoso basi lignoso ; foliis subradi- 
calibus lanceolato-linearibus albolanatis, scapis glabriusculis superne bis bi-trichotomis, in- 
volueris turbinato-campanulatis glabris 5-dentatis, dentibus rotundatis brevibus, perigoniis 
glabris, basi obtusis, laciniis oblongis subsequalibus ; ovario glabro. In pine and cedar woods, 
near Galisteo, New Mexico. Branches of the stem or caudex scarcely an inch long. Leaves 2 
inches long, 2-3 lines wide, revolute on the margin (in the dry specimens), tomentose on both 
sides, but less so above. Scapes 8-12 inches high, naked, mostly twice three-forked with very 
short bracts at the base of the somewhat spreading branches. Perianth pale purple, segments 
emarginate, the exterior ones a little broader. Achenium ovate with a long tapering summit, 
slightly scabrous on the angles above. Embryo incurved-excentric. "This resembles some forms 
of E. effusum, especially the var. rosmarinoides, Benth., but differs in the very short stem, 
nearly glabrous elongated scapes or peduncles and involucres, looser and more spreading in- 
florescence. Its habit is that of E. lachnogyuum, but it belongs to a different section, the 
embryo being strongly curved. 
ERIOGONUM POLYCLADON, Benth. l. c. p. 16. Gravelly hills, near Albuquerque, New Mexico; 
October. Annual. Bracteoles filiform, not glandular, with very long fringed hairs on ib 
margin. 
CHORIZANTHE MEMBRANACEA, Benth. in Linn. Trans. 17, p. 419, t. 17, f. 11. Hill-s'des, etc., 
Knight's Ferry, Stanislaus River; also near Sonora, California ; May. 
CHORIZANTHE PUNGENS, Benth, L. c. t. 19, f. 2. With the preceding species, May 8. 
PTEROSTEGIA DRYMARIOIDES, Fisch. € Mey. Ind. Sem. Hort. Petrop. 1835; Hook. & Arn. Bot, 
Beech. p. 387, t. 90. Rocky places, near Marysville; also at Knight's Ferry, Stanislaus 
River; Napa Valley; and mountains near San Gabriel, March—May. This plant is variable in 
the size and divisions of the leaves. In the specimens from near San Gabriel the leaves are 
deeply two-parted, and the divisions two-cleft, with entire or bifid segments. We have little 
doubt that among its forms must be included P. diphylla and P. microphylla. 
ACANTHOGONUM, Nov. Gen. 
Involucrum 1-2-florum, tripartitum, basi indurata subtrigonum, segmentis ineequalibus ovatis 
lanceolatisve apice subulato-pungentibus. Flos hermaphroditus sessilis, ima basi involucri 
