fa 



The West American Scientist — X 



86 



M. MICROMERIS Engelinann. Texas, 

 niushroom cactus, found in Texas, re- 

 sembles a silk-covered button, and can 

 be handled without gloves. The deli- 

 cate, starry net work of snowy-white 

 \ spines over the green plant gives it a 

 very beautiful appearance. 

 JVar Greggi i, larger, 



MAMMILLARIA MINIMA Reichb. A tiny 

 Mexican species, cylindrical, forming numer- 

 ic ous heads around the base, which readily take 

 root when detached. About 20 slender white 

 spines radiate from the center of each hemi- 

 spherical tubercle, enveloping the plant like 

 a bit of delicate lace; no central spine. 



Stands wet & heavy soil, 

 \ M. NICHOLSON I Hort Mexico. 



The plant 3 inches across, producing copious 

 wool in the depressed top, tubercles 4-angular, 

 crowded, 4 cruciate centrals, the longest Y 2 inch 

 ! & numerous short slender white radial spines. 

 MAMMILLARIA PECTINATA Engelm. 

 A beautiful plant bearing very large yellow 

 fls, 1% inches across when fully open, outer sep- 

 als reddish-green; petals sulphur yellow. 



M. PETfcRSONl, 'long whie spines interlac- 

 ing the plant, tine scarlet fls.' 



M. PKEIFFERI, covered with golden sp'ines 

 which 'fairly dazzle in the sunlight,' 



MAMMILLARIA PHELLOSPERMA E. 



Fls rose purple, blooming in the fall; many 

 soft white radial spines, 1-6 hooked brown or 

 black centrals, fiuit clavate, bright scarlet, as it 

 is a desert species n needs dryness. 



MAMMILLARIA PONDII Greene. 



MAMMILLARIA PUSILLA Sweet. 



'This beautiiul little cactus is always admired 

 for i i s briiiht silvery spines, which radiate in 

 the sun. fls yellowish white with a red stripe in 

 center of petal. 



M. RHOLMNTHA Link & Otto. Mexico. 



p lis produced in siiC''essi.>n during the sum- 

 mer, bright r>se, a pretty sort,. 



MAMMILLARIA ROSEANA Bndg. 

 MAMMILLARIA SCHEERII Muchlpf. 



MAMMILLARIA SENILTS Lodd. 

 MAMMILLARIA SPINOSISSIMA Lem. 



MAMMILLARIA STELLA-AURATA Mt. 



(■{olden-Star: yellow spines in a lia'-spreadLig 

 ptnr-like rosette, a dwarf, much branched 



MAMMILLARIA STROBILIFORMIS Shr. 



Petter known as tuberculosa. 2-5 in. high, of- 

 ten with globose branches at thebise 



MAMMILLARIA UNCINATA Zucc. 



Our plants of this >ire not typical, but a very 



pretty distinct form from Mexico. 



MAMMILLARIA WILCOXI Tourmey. 



MAMMILLARIA WRIGHTII Engelm. 



GenuH MELOCACTUS De Camlolle. 



MYRTILLOCACTUS GEOMETRIZANS C 



('• -reus geometrizans of old authors, probably 

 _Oi lial in i lie .sail. e. or a fo.m . 



Genus PiOPALEA Salm. 



NOPALEA AUBERI Salm-Dyck. A Cuban 

 cactus, of rapid growth, assuming a tree-like 

 form, and bearing numerous rose-colored flow- 

 ers with exsert stamens; the branches armed 

 with stout spines; readily grown from cut- 

 tings. 



NOPALEA COCCINELLIFERA Salm. 



The cochineal cactus; cuttings 



N. DEJECTA, Cuba, outings 



Genus OPUNTIA Tournefort. 



"Tube of the flower very short, cup. shaped. 

 Petals spreading or rarely erect. Ovary with 

 bristle-bearing areola; in the axils of small te- 

 rete deciduous sepals. Berry succulent or 

 sometimes dry, marked with bristly or spiny 

 areola?, truncate with a wide umbilicus. fSe'eds 

 large, white, compressed, with the embryo 

 coiled around the albumen: cotyledons large, 

 foliaceous. Articulated much-branched 



plants, of various shapes, low and prostrate, 

 or erect and shrub-like; young branches with 

 small terete subulate early deciduous leaves, 

 and in their axils an areola with numerous 

 short easily detached bristles and, nsually, 

 stouter spines, all barbed. Flowers on the 



joints of Ihe previous year, on the same areo- 

 lae with the spines, mostly large, open only in 

 sunlight. Fruit often edible, often large." — E. 



OPUNTIA ACANTHOCARPA E. & B. 



E-B 4:51 t 18 f 1-3, t 24 f 11 seeds. 

 E svn 308; k 5: 120. Wp an 5: 56. 

 Wat 1 405. ct 3: 454 461. Tourney 

 G-F 8:325. cov 4: 112 242 277. He 

 01. Kr 084. 



"Arhorescens; ramis alternis adscen- 

 dentibus; articulis cylinbricis; tuberculis 

 elongatis; aculeis 8-25 stellato-divarica- 

 tis; bacca subglobosa tuberculata acule- 

 ata; sen inibus multangnlaris. 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. arhorescens] 4-6 or 8' long, 

 about an inch in diameter; tubercles 9- 

 to lines long; interior spines i-i^', ex- 

 terior ones 4-10 lines long. Spines of fr 

 on the depressed tubercles 3-6 lin. long. 

 Seeds large, unlike those of any other 

 Opuntia seen by me-"— E syn. 



?0. californica E Em 157 f 11. 

 OPUNTIA ANGUSTATA E. & B. 



E-B 4: 30, t 7 f 3-4, t 22 f 11, seeds. 



