С anan 
176 | UNITED STATES AND MEXICAN BOUNDARY. 
Erroconum James, Benth. l. c. НІП sides and arroyas on the upper Rio Grande and its 
tributaries. 
ERIOGONUM FASCICULATUM, Benth. in Linn. Trans. 17, p. 411, £ in ро. Prodr. 1. с. Near 
San Felipe, etc., California ; Parry, Schott. 
Евтовохом POLIFOLIUM, Benth. in DC. Prodr. l. c. Sandy hills, San Felipe; Thurber, (No. 
587,) and near San Diego, California; Parry. Dr. Andrews found it also at Monterey. On 
the lower Gila ; Schott. This species forms bushy tufts one to two feet in diameter. 
卫 RIOGONUM WRIGHTII, Torr.; Benth. 1. с. p. 15. Hill sides, Copper Mines, and along the Rio 
Grande from Albuquerque to is great cafions ; frequent. Dry plains, Los Playas, Sonora, 
June; Thurber. Var. HELIANTHEMIFOLIUM. E. helianthemifolium, Benth. 1. c. Pine mountains 
east of SansLuis Rey, California ; Parry. 
Евтовохом vrRGATUM, Benth. in DC. Prodr. l. c. p. 16. мын places near бап Luis Rey, 
California ; Parry. This agrees very well with the original specimens of Frémont, named by 
Bentham, | 
ERI0GONUM GRACILE, Benth. Bot. Sulph. р. 46. Sandy ravines, Sonora, September ; Thurber. 
ERI0GONUM ACETOSELLOIDES, Torr.; Benth. in DC. Prodr. l. c. p. 162. Near Santa Barbara, 
California, August; Parry. The flowers are smaller and on longer pedicels than in specimens 
collected in the United States Exploring Expedition. 
Евтовохом VIMINEUM, Dougl.; Benth. in Trans. Lin. Soc. 17, p. 416. Sandy hills, San Felipe, 
California, May ; Thurber. 
ERIOGONUM MULTIFLORUM, Benth. l. c. Western Texas, along the lower Rio Grande to its 
mouth. 
_ ERIOGONUM annuum, Nutt. 1. c.; Benth. in DO. Prodr. l. с. p. 19. E. cymosum, Benth. 1. c. 
Alluvions of the Cibolo, a tributary of the Rio Grande, and rocky places, Howard’s Springs, 
August—September ; Bigelow. 
ERIOGONUM TENELLUM, Torr. in Ann. Lyc. New York, 2, p. 241; Benth. l. c. Mountains 
below San Elceario, and at the mouth of the Great Cafion of the Rio Grande; Bigelow, Parry ; 
also on the San Pedro, western Texas. (Nos. 619 and 1767, E ) iko of our specimens 
‚ are two feet high. 
Var. & PLATYPHYLLUM. Е. platyphyllum, Torr. ; Benth. l.c. On the Rio Grande, western 
Texas. (Nos. 618 and 1768, Wright.) кыры forms show а gradual transition from this 
variety to E. tenellum. 
ERIOGONUM TRICHOPODUM, Torr.; Benth. l. c. Dry ravines and rocky banks, along the Rio 
Grande from El Paso to the Great Cafion, and west to the Colorado of California, The leaves 
are all radical, orbicular, or roundish-ovate, cordate, on petioles much longer than the lamina. 
Евтовохом corpatum, Torr.; Benth. l. c. Near San Felipe, on the borders of the California 
desert ; Parry. 
Евтовохом THURBERI (n. sp.): annuum, humile, arachnoideo-lanosum ; foliis subradicalibus 
longe petiolatis late ovatis obtusis subcordatis rugosis, margine subundulatis, subtus incano- 
tomentosis ; caule superne divaricato 2-3-chotomo; pedunculis elongatis capillaribus ; involucris 
late campanulatis 5-6-fidis paucifloris; perigoniis glabris profunde 6-fidis, laciniis exterioribus 
superne reniformi-dilatatis medio constrictis; interioribus oblongo-subpanduriformibus. Sandy 
ravines, San Pasqual, California, Мау; Thurber. I have seen specimens of this plant collected | 
in California by Mr. Wallace. Leaves in а subradical cluster, about half an inch long undulate- 
rugose, pubescent above, white-tomentose underneath. Stem a scape about a span high tricho- 
