42 UNITED STATES AND MEXICAN BOUNDARY. 
shows, and assumes the shape of a small carrot, almost as large as the stem itself; in old 
specimens the root is very much larger than the whole stem and branches together. 
Subgen. 3. Leprpocersvs.* 
22. 0. GIGANTEUS, E. in Emory’s Rep. 1848: erectus, elatus, cylindricus, versus basin api- 
cemque sensim attenuatus, simplex seu parce ramosus, candelabriformis ; ramis paucis erectis 
caule brevioribus ; vertice applanato tomentoso; costis infra sub-13 sursum 18—21 rectis, 
vetustis (versus caulis basin) obtusis obtusissimisque, sursum e basi lata acutatis acie obtusatis 
subrepandis ; sinubus ad basin caulis latissimis versus apicem profundis acutis angustioribus 
angustissimisque ; areolis prominentibus ovato-orbiculatis, junioribus albido-tomentosis; aculeis 
rectis basi valde bulbosis tenuiter sulcatis et subangulatis albidis seu stramineis demum cinereis ; 
radialibus 12-16, imo summisque brevioribus, lateralibus (preecipue inferioribus) longioribus 
robustioribus, subinde aculeis adventitiis paucis setaceis sammo areolex margini adjectis ; aculeis 
centralibus 6 robustis albidis basi nigris apice rubellis demum totis cinereis, 4 inferioribus 
cruciatis quorum infimus longissimus validissimus deflexus , 2 superioribus brevioribus lateralibus 
sursum divergentibus; floribus versus apicem caulis ramorumque ageregatis ; ovarii ovati 
sepalis 30-40 squamiformibus triangulatis acutis ad axillam albido, seu fulvo-villosam acu- 
Jeolum unum alterumve nigricantem deciduum gerentibus ; sepalis tubi ampliati breviusculi 
_ 30-40 orbiculato-subdeltoideis mucronatis, inferioribus in axilla lanigeris, superioribus nudis; 
sepalis intimis 10-15 spathulatis obtusis carnosis (pallide viridibus albescentibus) ; petalis 
sub-25 obovato-spathulatis obtusis integris crispatis coriaceo-carnosis crassis (ochrolencis seu 
albidis) ; staminibus numerosissimis superiori tubi parti adnatis, inferiore nudo ; Stylo stamina 
-paullo superante ; stigmatibus 14-18 filiformibus fasciculatis ; bacca obovata seu sepe pyri- 
formi squamis triangulatis carnosis parvis ad axillam lanatis munita, floris rudimentis deciduis ; 
pericarpio duriusculo coriaceo demum valvis 3-4 irregularibus patulis reflexisye dehiscente ; 
seminibus numerosissimis in pulpa saccharina coccinea nidulantibus oblique obovatis 
lucidis exalbuminosis; hilo oblongo basilari ; 
(Tab. LXI, LXII, et tab. front.) 
In rocky valleys and on mountain sides, often in mere crevices of rocks, from the valley of Wil- 
liams’ river, lat. 35°, Bigelow, to Sonora, lat. 30°, Thurber, Schott ; and from the middle Gila, 
Emory, down to near itsmouth, Parry: I cannot find thati 
do, though it is probably also an inhabitant of the 
leevibus 
cotyledonibus foliaceis incumbentibus hamatis, 
5 times that height ; stems have heen measured 46 feet high, and higher ones are stated to 
occur, so that the first statement of Col. Emory is not at all improbable, viz: that this plant 
sometimes has been found 50-60 feet high. The stem is thickest in or a little above the 
Sat ae ae TNR NR PR SS PS gi) 
* This subgenus is proposed for the two tall western Species with uniform spines, short flowers, oy i 
ais subge : ' ary ard tube with numerous 
scale-like imbricated sepals, fleshy petals, pale stigmata, smooth seeds, and hooked embryo, Probably C. Chilensis, and perhaps 
‘Species from the Pacific slope of the continent, will find their place here. , 
A drawing of C. Chilensia among th f 
the United States Exploring Expedition, represents a flower almost identical wi th that of C. Thurberi a ng the papers 0 
* 
