SYNOPSIS OF THE CACTACEX OF THE UNITED STATES. 143 
. Camancuica, E. & B. in P. R. R.: prostrata; articulis adscendentibus majusculis suborbiculatis; pul- 
villis remotis plerisque armatis; setis stramineis fulvisve parcis ; aculeis 1-3 compressis fuscis apice pallidiorhion, 
superioribus elongatis beanie, ceteris deflexis ; bacca ovata late umbilicata; seminibus majusculis angulatis hilo 
excisis. 
Llano Estacado, on the Upper Canadian River. A large, extensively spreading plant; the joints 6-7 inches 
long; spines 13-2 or even 3 inches long. Fruit large, juicy. Seeds 2-3 lines in diameter, very irregular and deeply 
aie oe at the hilum. 
12. O. TorTIsPINA, E. & B. l.c.: prostrata; articulis adscendentibus majusculis suborbiculatis ; pulvillis 
subremotis; setis stramineis seu fulvis; aculeis 3-5 majoribus angulatis spe tortis albidis cum 2-4 gracilioribus ; 
bacca ovata late umbilicata; seminibus majusculis orbiculatis. 
On the Camanche plains, east of the elevated plateau of the Llano Estacado. — Similar in size and habit to the 
last species, its western neighbor, with more numerous spines than any other of our Opuntia with juicy fruit. Seeds 
regular, and only very slightly notched at the hilum. 
§ 3. SrrispiIn2: adscendentes: articuli ot. minores : Hap es teretes seu vix angulati, graciles, [294] 
xiles, pallidi: bacca 
O. renuisprna, E. in B. C. R.: ‘ite majusculis aa basi attenuatis lete viridibus ; pulvillis ae 
approximatis setas graciles breves fulvas gerentibus plerisque armatis ; aculeis 1-2 elongatis albidis cum 1-4 brevio 
bus inferioribus ; floris flavi ovario clavato ; petalis obovatis retusis ; bacca oblonga profunde Sahat : sicuintiods 
minoribus. 
and-hills near El Paso: flowers May. — Joints 3-6 inches — 2-4 wide ; leaves sr slender, hardly 2 lines 
long ; upper spines | suberect or spreading, 14-2} inches Jong. Flower 23-3 inches in diameter. Seeds less than 2 lines 
in diameter, very ar. — Similar in many respects to 0. atthe which grows with it; but readily dis- 
tinguished by the spines and fruit. 
ETISPINA, E. in Salm, H. D.: articulis suborbiculatis parvis glaucis ; pulvillis confertis setas flavidas 
14 s 
gerentibus, en ee armatis; aculeis 1-3 longioribus subangulatis et 3-7 brevioribus plus minus deflexis, omnibus 
illimis. 
Pine woods in the mountains west of Chihuahua, Dr. Wislizenus. — Joints not over 2 inches Jong; pulvilli only 
3—4 lines apart ; are spines 1-14 inches long, very slender, like bristles. Flower and fruit unknown. 
15. O, FILIPENDULA, E. in B, C. R.: glauca; radicibus nodoso-incrassatis ; articulis minoribus orbiculatis seu 
obovatis seu oblesestlate tenuibus; pulvillis casos atis setas virescenti-flavas graciles numerosas gerentibus armatis 
vel inermibus ; aculeis, si adsunt, 1-2 elongatis subangulatis cum 1-2 minoribus, omnibus albidis ; floris pur- 
wha Hi ovario gracili ; stiomatibas 5; tite minoribus tumidis. 
ivial bottoms of the Rio Grande near El Paso, and eastward on the Pecos: flowers May and June. — The 
long peer roots, the small bluish joints, with the very small leaves and very long bristles, together with the purple 
fice, and thick very narrowly margined seeds, distinguish this species from all others. Plant 6-12 inches high ; 
joints 13 inches long, 1-2 wide; pulvilli 46 lines apart ; lower spines 1-2 inches long. Flower 2} inches in 
diameter. Seed ly 2 lines in Satnietite: 
Ee 
§ 4. VuLGAREs ; procumbentes vel adscendentes: articuli plerumque minores : aculei validi, subteretes vel [295] 
nulli, albidi vel obscuriores : bacca clavata. 
16. O. Rartyesquit, E. in P. R. R.: diffusa; radice fibrosa ; articulis obovatis vel suborbiculatis perviridibus, 
foliis elongatis patulis; pulvillis subremotis setas graciles rufas gerentibus plerisque inermibus ; aculeis paucis 
marginalibus validis rectis singulis erectis aes uno alterove minore deflexo subinde adjecto, rnfo variegatis ; 
alabastro acuto; ovario clavato pulvillis 20-25 stipato ; petalis 10-12; stigmatibus 7-8; bacca clavata. 
Var. MICROSPERMA : subinermis; eae preutiee angustius marginatis. 
Sterile, sandy, or rocky soil in Sha Mississippi valley, from Kentucky to Missouri, and from Minnesota south- 
ward ; flowers May and June. — Joints 3-5 inches long ; leaves 3-4 lines long; spines 9-12 lines long, sometimes 
“oar wanting. Flowers 24-3} inches in diameter, yellow, often with a red centre. Seed 2$ lines, or in the variety 
less than 2 lines in diameter. — This species had been confounded with the eastern 0. vulgaris by all our botanists, 
ig the exception of Rafinesque, who pretended to mara three species, — namely, 0. humifusa, O: cespitosa, and 
O. mesacantha (sometimes erroneously accredited to Nuttal 1),— which cannot be made out, and which I have —- 
united under their author’s name.*— The pesperene: is probably only a southern variety of this species : — 
* The following extract is from a note by Dr. Engelmann I have now had Professor Wood’s specimen of Opuntia 
in the “ Bulletin of the Persp Botanical Club,” September, from Westchester Co., one from New sear oe by Mr. Mee- 
1871, II. p. 834. — Ens han, and a third from New England, probabl. 
