55 



Genus MAIHUENIA Phil. 

 M. POEPPIGII Weber. 

 M. BRACHYDELPHYS KS. 

 M. PHILIPPII Weber. 



PTEROCACTUS KUNTZEI KS. 

 Rebutia minuscula KS, is Echlnocactus 

 mlnusculus. 



Genus PERESKIA Plum. 

 PERESKIA ACULEATA Mill. 



The Barbadoes gooseberry or Blad-ap- 

 ple; the leaves resemble those of the or- 

 ange; much used for grafting purposes. 

 West Indies. 



PERESKIA BLEO P DC. 

 PERESKIA LYCHNIDIFLOR'A P DC. 

 PERESKIA PANAMENSIS Web. 

 PERESKIA TAMPICANA Web. 



Genus NOPAL.EA Salm. 



Erect, branching plants, with flattened 

 elongated joints; flowers red or crimson, 

 petals erect and silightly approaching 

 each other at the apex, stamens longer 

 than the corolla. 

 NOPALEA AUBERI Salm-Dyck. 



Cuba; rapid growth; arborescent in 

 f6rm, and bearing numerous rose-colored flow- 

 ers with exsert stamens; the bnanches armed 

 With stout spines; readily grown from cut- 

 tings. 

 NOPALEA COCCINELLIFERA Salm. 



The cochineal cactus, a native of Mex- 

 ico. 

 NOPALEA DEJECTA Salm. 



Salm-Dyck, Hort Dyck ed 2, 64, 233. 

 Cuba. 



NOPALEA KARWINSKIANA S. 

 NOPALEA MONILIFORMIS KS. 



Genns OPUNTIA Tonrnefort. 



"Tube of the flower very shorf, cup- 

 shaped: petals spreading or rarely erect: 

 ovary with bristle-bearing areolae in the 

 axils cf small terete dJeciduovs sepa's: 

 berry succulent or sometimes dry, mark- 

 ed with biistly or spiny areolae, truncate 

 with a wide umbilicus: seeds large, white, 

 compressed, w.th the embryo coiled round 

 the albumen; cotyledons la ge, lolla- 

 ceous.— Articulated, much-branched 



plants, of various shapes, low and pros- 

 trate or e.rect and shrub-like; young 

 branches with small terete subulate early 

 deciduous leaves, and in their axils an 

 areo a with numerovs short easily de- 

 tached bristles, and. usually, stouter 

 spires, all barbed. Flowers on the joints 

 of the previous year, on the same areolae 

 with the spines, mostly large, open only 

 In sunlight. FrUit often edible, often 

 large." — E. 



Opunfa auberl Pf, is Nopalea auberi. 

 Opuntia camuessa Web, is robusta. 

 Opuntia decumana Gris, is monacantha. 

 Opuntia flavlcans Lem, is robusta. 

 Opuntia maxima Hort (non Web), is ro- 



Opuntia stenopetala E, is glauscescens. 



Subgenus CYLINDROPUNTlA E.— 

 "Joints cylindrical, more or less tubercu- 



Cactii— Orcutt. 



S6 



lated; rhaphe usually not prominent, 

 therefore seed not margined; embryo 

 forming less than one circle around fke 

 more copious albumen; cotyledons incon- 

 stant, contrary, oblique, or parallel to the 

 sides of the seed."— E^ 



OPUNTIA ACANTHOCARPA E. & B. 



"Arborescens; ramis alternis adscen- 

 dentibus; articulis cylindricis; tuberculis 

 elongatis; aculeis 8-25 stellato-divarica- 

 tis; bacca subglobosa tuberculata acule- 

 ata; seminibus multangularis. Mountains 

 of Cactus Pass, between Santa Fe and 

 the western Colorado. Stems 5-6° high; 

 branches few, alternate, and separating 

 from the stem at an acute angle. Joints 

 as in fO. arborescens] 4-6 or 8'' long, 

 about an inch in diameter; tubercles 9-19 

 lines long; intener spines i-iX^» exteri- 

 or ones 4-10 lines long. Spines of fruit 

 on the depressed tubercles 3-6 lin. long. 

 Seeds large, unlike those of any other 

 Opuntia seen by me." — E syn 308. 



?0. californica E Emory's rep 157 f 11. 

 OPUNTIA ALCAHES Web. 

 OPUNTIA ANDICOLA Pfeiffer, 

 OPUNTIA AORACANTHA Lem. 

 OPUNTIA ARBORESCENS Engelm. 



"Caule ligneo erecto, ramis horizon- 

 talibus, ramulis cylindricis, tuberculatis' 

 aculeatissimis; areolis oblongis, brevissi- 

 me tomentosis, aculeos 12-30 corneos 

 stramineo-vaginatos teretes undique por- 

 rectos gerentibus; ramulis versus apicem 

 floriferis; ovario tuberculato, tuberculis 

 sub-20 apice sepala subulata et areolas 

 tomentosas cum setis paucis albidis ger- 

 entibus; sepalis interioribus 10-13 obova- 

 tis; petalis obovatis, obtusis s. e margin- 

 atis; stigmatibus sub-8 patulis; bacca fla- 

 va, sicca, ovato-globosa, tuberculata, 

 profunde umbilicata. Mountains of New 

 Mexico to Chihuahua, Parras and Saltil- 

 lo; flowers in May and Je; fruit, at least 

 about Santa Fe, ripening the 2nd year 

 (Fendler); in the north 5-10, south 20 

 and more feet high, 5-10^ in diam, last 

 branches 2-4'' long; spines of the speci- 

 mens on Waggon-mound 20-30 in each 

 bunch; further south only 12-20, gentr- 



