Cacti.— Orcutt. 



young plants with 17 obtuse ribs and 

 deep intervals. 12-13 ribs in older plants 

 anil more obtuse, areolae V?.inch apart; 

 10-12 radial spines, slender, straw-co creel, 

 centrals 4-5, the lower one tne longest, 

 the upper portion of the older or florifer- 

 'lus stems suppliei with numerous ciliary 

 wlite spines. es^pe-iaMy abundant on the 

 side where the fit wers are pioiuced: flow- 

 er 2 inches across, a incnes long (includ- 

 ing the ovary); about 25 lon^ narrow 

 scales on ovary with 6-12 fine white hairs 

 }&-l inch long in the ax Is. ova -y apple 

 grten ; p.^;als about :0,8-;0 mm' troal, 

 nearly 20 long, acute. white; sepals 

 equally numerous, brownish white; style 

 21-^ inches long, whitish, nearly fqualling 

 the petals: fi aments white, anthers an 

 eighth ;nch long and pale yellow. Flower 

 deeply embedde.l in a miss of persistent 

 hairs an inch long and of a snowy white 

 —tinged -with yellow o'^casionally at the 

 t'ps. F:uit rearly rlo' ular, I'A inches 

 lonsr. dull pun le wth a bluish I loom; 

 remains of flower persistent; the minute 

 scales at^d halts abundant or nearly ab- 

 sent; cuter sl<in V* inch thick, dull purple, 

 the edible pulp 1 right m g;nta. rathtr 

 insipid, sweetish, seecs I lack. Vieia, or 

 Old' Woman cactus of the MexiCAns. 

 States of PueMa and Oaxaca, Mexico 

 rOrcutt 2<)'9, 2679). 

 C. COMMNA-TRAJANI KS. 



Erect, 15-20 feeti high, 2-3 short branch- 

 es slightly divergent from the main stem 

 a few fe(=t fro'^^ the ground: 5-7 ra lial 

 spne; one-f( urth to three-fourths inch 

 long. 1 central V2-2 inches long, rarely a 

 s'lor e*" central cr ralial above; radials 

 latcra'ly disposed except the 'owest, all 

 ashy black. Ribs U-13 in young plants, 

 obtuse with shallow intervals. Te-te-cho 

 of the Mexicans, who de.'^cribe the fruit 

 as sv eet ard fd'ble. the flower as red. 

 States of Puebla and Oaxaca, Mexico 

 (Orcutt 2706). 

 C. Hoppenstedtii KS. is Pilocerus Hop- 



penstedtii Web fide KS. 

 C. MACROCEPHALUS Web. 

 C. MELOCACTXTS KS. 

 O. SENILIS Pf. 



Genns CEREVS Havvorth. 



"Flowers about as long as wide or elon- 

 gated. Scales of the ovary d'stinct, with 

 naked or woolly axils, or almost obsolete 

 and the axils spiny. Berry succulent, 

 covered with spines or scales or almost 

 naked. Seeds black, without albumen. 

 Embryo short and straight or curved or 

 ho(ked: cotyebns usually contrary to 

 the sides of the seed. — Plarts of all sizes, 

 low or climbing or erect, sometimes enor- 

 mous; spin' -bearing areo'ae on vertical 

 ribs. Flowers from the older or, at least. 

 fully formed t arts cf the plant, not from 

 any preformed areo'a, but buvs'.ing 

 througb the epideiml^; .iust above the 

 bunches of spines: some r pen only in sun- 

 light, others only at right, others again 

 are not thus influenced. Fruit often edi- 

 1ile, sometimes of very large size."— E. 



Subgenus EUCEREUS. ; "Prismatic or 

 cvlindiic, mostly branching: fliwers usu- 

 ally longer than wide: stigmas wh'tish: 

 seeds obovate, usually smooth or pitted: 



emb; yo with 

 d'ons."— E. 



fol aceous crved to yle- 



mM 



> 1:! 



CEVREUS COLUBRINUS Otto. 



CEREUS ACULEATUS Otto. 

 CEiREUS ALAMOSENSIS Coulter. 



Sina spinosa of Sonora; 2-S feet high, 2- 

 10 branches from the base with joints 1-1 

 feet long, flexuous or decumbent, often 

 forming arches and rooting at the joints, 

 and thus spreading over wide areas, some- 

 times 100 feet in diameter or more; ribs 

 about 7, slightly tuberculated. The bright 



