APPENDIX SS. 1833 



familar with the flora of Colorado west of the Rocky Mountains, and particularly of 

 the San Juan region, has kindly furnished, at our request, some botanical notes of 

 great value, which follow the classification of Professor Gray. Not being personally 

 a man of means, and all the work of the reconnaissance having to he done without any 

 appropriation, his contribution Avas made as a personal favor, and we therefore desire 

 to tender him our sincere thanks. 



Section I. — Classification of Professor Gray. 



Letter of transmittal. 



Herbarium of Harvard University, 

 Botanic Garden, Cambridge, Mass., 



June 23, 1878. 



Lieutenant : I inclose you herewith a list of the plants sent me in April last, col- 

 lected by you in your reconnaissance of the San Juan region of Colorado, &c, in 1877, 

 and classified at your request. 

 Sincerely yours, 



Asa Gray. 

 Lieutenant McCauley, U. S. A., 



Fort Leavemcortli, Kans. 



CLASSIFICATION OF THE BOTANICAL COLLECTION MADE DURING THE 

 SAN JUAN RECONNAISSANCE OF 1877, IN COLORADO AND NEW MEXICO. 



By Prof. Asa Gray. 



[Species -which are not in Porters and Coulter's Synopsis of the Flora of Colorado are in italics. For 

 convenience of reference the species are enumerated in the order of that "svork.] 



RANUNCULACEiE. 



Clematis ligusticifolia, Nutt. 

 Thalictrum Fendlen, Engelm. (156). 



Upper Chama, &c. 

 Ranunculus nivalis, L. ('29, 33). 

 Ranunculus affinis, R. Br. 

 Ranunculus cvmbalaria, Pursh. 



Caltha leptosepala, DC. (25, 89, 88, 109, 515, 500, 365, 367). 

 Trollius laxus, Salisb. (36, 28, 62, 116, 117, 112). 

 Aquilegia cserulea, Torr. * (154, 155, 194, 196, 154, 311, 272-278, 287, 292, 197, 205, 206, 207, 



209, 211). 

 Delphinium scopulorum, Gray (124, 140, 193, 238, 389). 

 Aconitum nasutum, Fisch. (498). 



BERBERIDACE^. 



Berberis Aquifolium, repens, Lindl. (1282), leaves. 



Observed abundantly on the upper regions of nearly all rivers meandered, August 

 and September. 



FUMARIACE^. 



Corydalis Caseana, Grayt (1116 and 1132 of the collection). 



Also observed, August, 1877, when encamped near Bonn's Cabin, in a small park at 

 the head of the upper canon of the Rio San Juan, the altitude of the camp being 

 9,860 feet. 



* Avery abundant and beautiful flower, commonly known as the " Mountain Colum- 

 bine," habitat all regions from 7,000 to 12,300 feet, June to September, preferring rocky 

 localities. Remarkably handsome specimens were observed in the Needle Mountains 

 or Quartzite Crags, and gathered at an altitude, above timber-line, at some 12,300 feet. 

 It ranges higher in the Lower San Juan than on Gray's Peak, where it was gathered in 

 August, 1876. 



t Proc. Am. Acad, x, 69. This striking species was described from specimens col- 

 lected in the Sierra Nevada, California, and it has recently been found by Mr. Cusick 

 as far north as Union County, Oregon. I myself collected it in the Wahsatch Mount- 

 ains, Utah, at the head of the American Fork Canon, in August, 1877. Mr. Brandegee 

 collected it in 1875 in the San Juan region, between Rio Piedra and Los Pinos, at the 

 elevation of 10,000 feet, and it is now found in the mountains about the Rio Blanco, 

 at nearlv the same elevation. 



