NOTES AND CORRECTIONS. ‘ili 
does not form a connecting link.’’ It is often assumed, and with apparent plausibility, that these plants are more easily 
studied in the field than in the herbarium; but the experience of our collectors, and the history of this little plant of Mr. 
Schott, proves — these difficulties are inherent in the subject, which requires close discrimination, with patient and 
laborious investigati 
The plant above pron was collected at Escondido springs, on the El Paso road, near the Pecos, a locality often 
previous ad visitel by every one of the botanists of the boundary commission, with the gn perhaps, of Mr. Thurber, 
who crossed the Pecos somewhat higher up, on his trip to El aoa in the fall of 1850. Mr. Schott, himself, passed it several 
times petal Mr. Wright passed it four several times, and Dr. Parry, an acute and discriminating collector of Cactacee, 
certainly passed it once. We all failed to detect it, while passing ‘ie locality, at two different seasons of the year. In 
boundary publication of Cactacea are six or seven pretty distinct species, besides the one under consideration, that in 
general habit and arrangement of spines would be taken as mere varieties, were it not for the beautiful permanent dis- 
tinctions presented by the flower and fruit, whi on are difficult to secure on wets surveys and government expeditions. 
‘*The Cactacexw have not heretofore etn well studied in the United States,’’ page 2. owever well this observation 
might apply at the time my memoir was written, the patient labor and enlightened researches of Dr. Engelmann since 
uite 
that pe on the collections of the boundary commission, as well as Pacific railroad surveys and explorations, show qui 
a state of things now ; so that this will ccmpare favorably with any other department of 
8. schon weap tide: " page 4, is probably Dasyiirion Texanvm, although, as Dr. Torrey thinks, it may be 
undescribed . Professor Lindley places this — in the pine apple family. It appears to me site more nearly 
species 
allied to tho low-caudexed form of palms. 
.9. ‘Opuntia Engelmanni,’’ pages 4, 16, 37, and 38. At Delaware Mount, long. 97°, I first found this plant ; an 
Opuntia Sarees which Dr. Engelmann, in aie undary Cactacex, has in ndicated as only a sub-species, is 9000 tt 
co. 
has a range of over 20° east < west. Sout iii tt extends to the Gulf of Mex 
10. “ Thym mona min mca page 4, is oad HYMENATHERUM ACEROsUM, Gray 
11. ‘‘Pinus brachyp ”” pages 4, 8, 9, 14, 26, 134, and 141, is Prnus Encermannt, Torrey. 
12. {‘ Balsam Fir,’’ sna 6, 18, 23, and aa ae Torrey says he names this Apres Batsamga on my authority. I suc- 
ceeded in getting broken cones at Sandia mountain, which answered to the description of A. Barsamma very well. A 
critizal examination of it was not m 
13. ‘‘ Three kinds of Cedar,’’ pages 4 9, 15, 20, 141, and 142. They are Juniperus TEeTRAGONA, ee 5 JUNIPERUS 
occipENTALis, Hook., and JuNIPERUS PACHYPHLEZA, Torrey, new species. JUNIPERUS VIRGINIANA was also met wi 
14. ‘* New species oe Opuntia,’’ pages 7 and 41 , is OPUNTIA BRACHYARTHRA, Z. & B., new species. 
15. Pes arborescent Opuntia,’’ called also ‘‘our new Cactodendron,’’ pages 7 and 11, is Opuntia Wuurrrtet, EF. & B., 
new species. 
Bie Baily ngsregnted Cereus,’’ pages 7 and 10, is Cerevs Mosavensis, var. Zunrensis, FE. & B., new species. 
17. ‘‘Large oval masses,’’ pages 7—10, for the manner of growth of many Cerei is not a proper term. When the stems 
t heads are from 100 to 200, 25 are hemispherical or sub-hemispherical in form. When the masses are larger, they are 
ae on the t 
8. ‘*Cereus atin pages 7 and 12, is Cereus Enceitmannt, Parry, var. variecatus, Ek & B. 
19. Santee pinnata,’’ page 7, and ‘ Blue-berried barbery,’’ page 10, is BerBERIs TRIFOBIATA, Morieand. 
4c t Ho ope, 77 
20. 8, is a peak of the Aztec mountains of our line. e 
21. ‘satis oh Umbelliferous family,’’ page 8, is Crmoprerus MonTaNA, Vutt 
22. age lamentose-leayed Yucca,’’ page 9, was not determined by —_ Torrey, for the want of more perfect 
‘Sg geen iias ” page 9. .If this is different from the one oe on Pinus Engelmanni, Dr. money has failed to 
ate it in his account of the Lotaiiths of the collections 
24, ‘‘Fraxinus velutinus,’’ page 10, is omar PISTACLEFOLIA, evi 
25. ‘‘Small order of Garryacex,’’ page 10. It appears we have three or four species of this genus in the west. 
26.24 a shrubby Spirea,’’ page 10, is a new species, Sprr#a Mirterotium, Torrey. 
27. ‘‘Madrona,”’ page 10, is Arp — oom Pursh. 
ae. * hetiiatl, very common,”’ 11, is Mamr“tarta vivipaRA, Zaw., var. Neo-Mexicana, Engi. 
29. ‘Opuntia, never before seen on our route,’’ and ‘0. Tidballii,’’ page 11, is Opuntia cutororica, FH. & B., new 
species. 
8 ‘Opuntia, similar to O. Engelmanni,”’ page 11, is Opuntia procumpens, B. & B., new species. 
31. ‘‘Green-barked acacia,’’ page 11, is Cencip1um FrLorrpum, Benth. 
‘‘Two other leguminous trees,’’ page 11, one, as seated is Otneya Trsota, Gray, the other is PARKINSONIA MICRO- 
PHYLLA, y. 
33. ‘‘ Echinocactus a Engl.,’’ pages 12—14, is Ecutnocacrus Leconret, Engl. The same mistake soneeeed by 
Drs. Parry and Le Cont 
34. ‘* Globose Mani page 12, is Mamrttaria Granamt, Engl., and a little further westward, in the Colorado 
valley, Mamintarra pr€ztosrerma was found. These, with two others, M. Wricurm and M. Ici, are so nearly alike 
in shape and arrangement of spines as to be easily — if not examined in flower and fruit, in which state they 
preserve beautifully distinct and permanent characters. 
