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the name of O vaginata, 1 8 as the straw-colbred loose sheaths of the |j 
spines are very remarkable. A new Echinocereus was also collected h^: 
which, on account of its dense covering with small spines, I have nan 
E. dasyacaivthus. 19 I have in cultivation one of the largest specimen , 
seen by Dr. Wislizenus, which is one foot high. In this neighborhood p 
Opuntia Tuna , Mill., was seen for the first time,-and this is perhaps# 0 * 
most northern limit of that extensively diffused species, as well as P°f 
Agave americana, another common Mexican plant. Both were found] 
greater perfection near Chihuahua, and from there constantly down J appeal 
Monterey, and the mouth of the Rio Grande; the Opuntia appears to exteifJ * sci 
also high up ih Texas. # ' u a .^' : ' aere ? 
Together with these a J)asylirion, perhaps the same as the Texa:« an( * 
species, was found here* and afterwards again near Saltillo. 1 
From El Paso to Chihuahua, the road lies in part through a dreadfully near 
arid sandhill district, &here a peculiar Marty nia z * was observed, and fu rs, j 
__ Airnstt 
Opuntia vaginata , n. sp. caule lignoso, erecto, ramulis *tereti‘bifs VC,, 
tuberculatisfareolis orbiculatis§ albo-tomentosis, margine superiore fascicv' lU J ( 
him setarum breviuni fuscarum, infieriore aculeum elongatum corneumy 
vagina laxa straminea involutum, deflexum gerentibus; floribus parvir u 
ovario obovato, areolis J 3 tomentosis setigeris stipato; sepalis interioribus ^ cir 
et petalis 5 obovatis mUcronatis; bacca obovata profunde umbiheataf ca? ea , 
nosa, aurantiaca, seminibus paucis. ‘ raP * sbes l c 
On the mountains hear El Paso; in August in flower and fruit. Belong 801 
to Opuntiae cylindraceae gmciliores, (Salm-Dyck;) perhaps nearest to 1“ 
virgata, H. V., but distinguished by the longer deflexed spines. Appj™ 
rently 3 dr 4 feet high, ultimate branches 2^ to 3 lines in diameter; spinr /e 1 
single, to 2 inches long, rarely with a "second smaller one, straigh— 
more or less deflexed; epidermical sheath yellow or brownish, very IogJjj 
at last coming off. Ovary 4 to 5 lines long; flower 6 to 9*tines in $iaflp 
ter, pale yellow, with a greenish tinge; stigma Jpnic, witfo 5 adpreslfy^ 
segments; fruit 7 to 8 lines long. . s 
19 Echinocereus dasyacanthus, n. sp. ovatomblongus, s. subeylindricu :( ] ent i ( 
17-18 chstatus, costis tuberculatis subinterruptis, areolis approximation, 
ovato-lanceolatis, junioribus albo-villosis; aculeis albidis, junioribus 
rufidis, radialibus sub-IS porrectis, summis brevioribus tenuioribus, ,Hf®i 0fe> 
alibus inferioribusque longioribus; central ibus 4-6 plnribus deflexis. -I® sand 
El Paso del Norte. The specimen before me, one of the largest, ;is 3 lSr anc 
inches highland 3| inches below, and 2 inches above in diameter; wo, an( j 
on the youn^ areolae unusually > long, deciduous ; upper spines 3 lin| ^ 
long, lqwer lateral ones slightly compressed 6 to 7 lines long, lowest |’ se j 
lines long; central spines nearly as fong as the last, stouter than the othS’J[ es 
From E. pectinatus and E. caespitosus , m which it resembles, it is disti • 
guished by* the lohger, not appressed spines, the larger number and-size 
the central spines, &c^ % 1 * * 
s 0 Martynia arenaria , n. sp. annua, glandiiloso-pilosa foliis alterni i0 ‘ j‘ 
longe petiolatis, coraatis, 3-5-7 lpbatis, lobis rotuhdatis, repando-dentS ’ . 
latis; bracteis lanceolatis ealyeem obliquum, infra fissum, dimidiuj^Jj, 
quantibus; staminibus 4; rostro pericarpium aequante. * . m | 
Sandhills below El Paso, flowers August. Leaves 1^ to 2 inches # wi< 
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