176 UNITED STATES AND MEXICAN BOUNDARY. 



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Ehiogonum Ja^iesiIj Benth, L c. Hill sides and arroyas on the upper Rio Grande and its 

 tributaries. 



Eriogoxum FASCicuLATUM, Benth. in Linn. Trans. 17, p. 411, cfi in DC. Prodr. ?. e. Near 

 San Felipe, etc., California ; Parry ^ Schott. 



Eriogonum polifolium^ Benfh. in BG. Prodr. I. c. Sandy hillSj San Felipe ; TMrher, (No. 

 687,) and near San Diego, California ; Parry. Dr. Andrews found it also at Monterey. On 

 the lower Gila ; ScJiott. This species forms bushy tufts one to two feet in diameter. 



Ehiogonum Wrightii, Torr.; Beni/i. l. c. p. 15. Hill sides. Copper Mines, and along the Rio 



Grande from Albuquerque to the great canons ; frequent. Dry plains^ Los Playas, Sonora, 



June ; Thurher. Var. heliantuemifolium. E. helianthemifolium, Bentli. Z. c. Pine mountains 

 east of San Luis Rey, California ; Parry. 



Eriogonum viRGATUM, BeutJi. in DO. Prodr. L c, p. 16. Grassy places near San Luis Rey, 

 California ; Parry. This agrees very well with the original specimens of Fremont, named by 

 Bentham. 



Eriogonem GR agile, Beuth. Bot. Sulph. p. 46. Sandy ravines, Sonora, September; Thurher. 



Eriogonum ACETOSELLOIDES, Torr.; Benth. in BG. Prodr. I. c. p. 16?. Near Santa Barbara, 



California, August ; Parry. The flowers are smaller and on longer pedicels than in specimens 

 collected in the United States Exploring Expedition. 



Eriogonum vimineum, Bough; Benth. in Trans. Lin. JSoc. 17,_?>, 416, Sandy hills, San Felipe, 



California, May ; Thurher. 



Eriogonum multiplorum, Benth. L c. Western Texas, along the lower Rio Grande to its 



mouth. 



Eriogonum annuum, N^utt. I. c; Benth. in DG. Prodr. ?. c. p. 19. E. cymosum, Benth. Z. c. 

 Alluvions of the Cibolo, a tributary of the Rio Grande, and rocky places, Howard's Springs, 

 August — September ; Bigeloiv. 



Eriogonum tenellum, Torr. in Ann. Lye. New Yorlc^ 2, p. 241 ; Benth. I. c. Mountains 

 below San Elceario, and at the mouth of the Great Canon of the Rio Grande ; BigelotOy Parry ; 

 also on the San Pedro, western Texas. (Nos. 619 and 1767, Wright.) Some of our specimens 



are two feet high. 



i5 



um, Torr. ; Benth. L c. On the Rio Grande, western 



Texas. (Nos. 618 and 1768, Wright.) Intermediate forms show a gradual transition from this 

 variety to E. tenellura, 



Eriogonum trichopodum, Torr.; Benth. I. c. Dry ravines and rocky banks, along the Rio 

 Grande from El Paso to the Great Canon, and west to the Colorado of California, The leaves 

 are all radical, orbicular, or roundish-ovate, cordate, on petioles much longer than the lamina. 



Eriogonum corbatum, Torr,; Benth. I. c. Near San Felipe, on the borders of the California 

 desert ; Parry. 



Eriogonum Thurberi (n. sp.) : annuum, humile, arachnoideo-lanosum ; foliis subradicalibus 

 longe petiolatis late ovatis obtusis subcordatis rugosis, margine subundulatis, subtus incano- 

 tomentosis ; caule superne divaricate 2-3-chotomo; pedunculis elongatis capillaribus ; involucris 

 late campanulatis 5-6-fidi8 paucifloris ; perigoniis glabris profunde 6-fidis, laciniis exterioribus 

 superne reniformi-dilatatis medio constrictis; interioribus oblongo-subpanduriformibus. Sandy 

 ravines, San Pasqual, California, May ; Thurher. I have seen specimens of this plant collected 

 in California by Mr. Wallace. Leaves in a subradical cluster, about half an inch long undulate- 



r ^^^ 



rugose, pubescent above, white-tomentose underneath. Stem a scape about a span high tricho- 



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