55 



Genus MAIHUENIA Phil. 

 M. POEPPIGII Wetoer. 

 M. BRACHYDELPHYS KS. 

 M. PHILIPPII Weber. 



PTEROCACTUS KUNTZEI KS. 

 Rebutia minuseula KS, is Echinocactus 



minusculus. 



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 LYCHNIDIFLORA, P DC. 

 PERESKIA PANAMENSIS Web. 

 PERESKIA TAMPICANA Web. 



Genus NOPALEA Salm, 



Erect, branching plants, with flattened 

 elongated joints; flowers red or crimson, 

 petals erect and slightly approaching 

 each other at the apex, stamens longer 

 than the corolla. 



NOPALEA AUBERI Salm-Dyck. 



Cuba; rapid growth; arborescent in 

 form, and bearing numerous rose-colored flow- 

 ers with exsert stamens; the branches armed 

 with stout spines; readily grown from cut- 

 tings. 



NOPALEA COCCINELLIPERA 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. 



Genus OPUNTIA Tournefort. 



"Tube of the flower very short, cup- 

 shaped: petals spreading or rarely erect: 

 ovary with bristle-bearing areolae in the 

 axils cf small terete deciduous sepals: 

 beiry succulent or bometimes dry, mark- 

 ed with biistly or spiny areolae, truncate 

 with a wide umbilicus: seeds large, white, 

 compressed, w.th the embryo colled round 

 the albumen; cot ledo.is la ge, folia- 

 ceous. — Articulated, much branched 



plants, of various shapes, low and pros- 

 trate or erect and shrub-like; young 

 branches Vvith small terete subulate early 

 deciduous leaves, and in their axils an 

 areola with numerois short easily de- 

 tached bristles, and, usually, stouter 

 spines, 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. 



Opuntia auberi Pf, is Nopalea auberi. 

 Opuntia camuessa Web, is, robusta. 

 Opuntia decumana Gris, is monacantha. 

 Opuntia flavicans Lem,, is robusta. 

 Opuntia maxima Hort (non Web), is ro- 

 busta. 

 Opuntia stenopeta'a E, is glauscescens. 



Subgenus CYLINDROPUNTIA E,— 

 "Joints cylindrical, more or less tubercu- 



Cacti.— Orcutt. 



56 



lated; rhaphe usually not prominent, 

 therefore seed not margined; embryo 

 forming less than one circle around the 

 more copious albumen; cotyledons incon- 

 stant, contrary, oblique, or parallel to the 

 sides of the seed."— B. 



OPUNTIA ACANTHOCARPA E. & B. 



"Arborescens; ramis alternis adscen- 

 dentibus; articulis cylindricis; tuberculis 

 elongatis; aculeis 8-25 stellato-divarica- 

 tis; bacca subglobosa tuberculata acule- 

 ata; eeminibus 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 [O. arborescens] 4-6 or S / long, 

 about an inch in diameter; tubercles 9-19 

 lines long; intener spines \-\%' , 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 n # 

 OPUNTIA ALCAHEIS 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, 

 prolunde 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, s-io' 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, gener- 



