130 SYNOPSIS OF THE CACTACEH OF THE UNITED STATES. 
Var. y. ROBUSTIOR, E. in Pl. Lindh. 1850: subsimplex; tuberculis longioribus laxioribus, aculeis robustioribus 
sated Sa 10-12, centrali singulo ; floribus majoribus ; stigmatibus 7-8 patulis ; seminibus ut in B. 
s east of the Rocky and New Wsivkh Mountains. Var. a. on the tee Sibi uri; 8. from Kansas River 
to New pater in Texas; y. from the Canadian River to the Colotado of Texas. The heads are one or two inches 
in diameter ; the cespitose masses of B. often a foot broad; spines 3-8 lines long. Flowers 1-2 inches long and wide, 
of a greenish or reddish or pure pale-yellow color. Seeds 0.8-1.1 line in diameter, more regularly globose than in 
most other Cactacex. 
16. M. ScnEErt, Muhlenpf. 1847; 8. ? vatipa, E. in B. C. R.: magna, ovato-globosa, subsimplex, glaucescens ; 
tuberculis remotis patulis magnis e basi lata subcylindricis supra suleo profundo glandulis paucis munito (juniore 
lanato) subbilobis ; areolis junioribus dense lanatis ; aculeis 10-20 rectis robustis basi bulbosis albidis s. citrinis apice 
fuscatis, radialibus 9-16 ; centralibus 1-5 validioribus angulatis ; floribus flavis ex axillis junioribus tomentosissimis, 
andy ridges in the valley of the Rio Grande near El Paso: fl. July. The largest of our Northern Mamillarie, 
7 inches high and 5 in diameter ; tubercles 1-14 inches long ; pone 10-18 lines in length, very stout, especially the 
central and lower radial ones. Flower 2 inches long, yellow. Fruit not seen. — M. Scheerii from Chibuahua, accord- 
ing to Prince Salm’s description, is a smaller plant, with single central spines one inch in length, and 8-11 much 
shorter radial spines; the areolw are described as naked : — nevertheless our plant is probably only the Northern form 
of this species. 
17. M. ropustisprna, A. Schott, in litt. : simplex s. czespitosa ; tuberculis patulis ga magnis sulcatis ; 
areolis junioribus dense tomentosis ; aculeis radialibus 12-15 robustis inferioribus robustioribu: atis, superi- 
oribus rectis fasciculatis paullo teuntorihes, centrali singulo valido compresso recurvato, auibe us Sainatiestt cor- 
neis apice pei floribus luteis ex axillis junioribus tomentosissimis; seminibus magnis obovatis fuscis levibus. 
grassy prairies: fl. July. Tubercles nearly an inch long, and an inch distant from one an- [266] 
other; spines san lines long. Flowers 2 inches long, characterized by a very slender, constricted tube, very 
different from the wide tube of the foregoing species. Seeds fully 14 lines long, larger than those of any other Mamil- 
laria examined by me: embryo with some albumen, curved ; cotyledons foliaceous! approaching the structure of the 
seed - most Echinocacti. 
. M. REcuRVISPINA, E. in B. C. R.: simplex, depresso-globosa ; tuberculis ovatis profunde sulcatis confertis ; 
eas pach ovatis, aculeis radialibus 12-20 rigidis recurvis intertextis albidis corneisve, aculeo centrali singulo 
(taro binis) robustiore longiore decurvato ; floribus flavicantibas extus fuscatis ex axillis junioribus villosissimis. 
nora: fl. July. Single heads 3-8 inches in diameter ; tubercles 5-6 lines long ; spines 4-9 lines long. upper 
ones often a little longer than the lower ones ; central] spine 6-10 lines long, darker. Flowers 1} inches long. his 
plant bears the closest resemblance to the next species, and must perhaps be classed with it ; but in the dry specimen 
before me the flowers are not exactly vertical, as in that species. 
« * Densiflore. (Flowers and fruit remain central in the very woolly vertex of the plant, no new tubercles being 
developed before the fruit falls off ; berries of all the species known to me oval, green ; seeds brown, smooth.) 
19. M. compacta, E. in Wisl. Rep.: simplex, depresso-globosa ; tuberculis abbreviato-conicis sulcatis confertis ; 
areolis ovato-lanceolatis, aculeis radialibus 13-16 rigidis recurvis intertextis albidis corneisve, aculeo centrali erecto 
plerumque deficiente ; floribus flavis extus fuscatis minoribus. 
Cosiquiriachi, west of Chihuahua: fl. June and July. Plant 2-4 inches in diameter; distinguished from the last 
species by the acutish (not obtuse) taluneled: the more elongated areola, the erect central s spine, which however is 
wanting in most specimens, and principally by the smaller and truly vertical flowers. Spines 5-10 lines long; flower 
1}-1} inches long and wide ; seed 0.7 line long. 
20. M. snipe E. in B. C. R. : simplex, globosa ; tuberculis conicis abbreviatis, summis floriferis teretibus 
longioribus sulcatis ; areolis oblongis ; aculeis 16-24 rigidis recurvis intertextis subsequalibus s. in as summis 
superioribus Stites taaciedlntia ceisiibens radiantibus corneis s. albidis ; floribus magnis sulphur 
O Pecos River, in Western Texas: fl. July. — Plant 1-2 inches in diameter. eae ere 2-3, [267] 
floriferous ones 5-6 lines long; spines 3-5, upper fasciculated ones 6-9 lines long. Flower 2$-3 inches in 
diameter ; seed 0.9 line long. 
21. M. Ecurnvs, E. 1. .: simplex, globosa; tuberculis tereticonicis ; areolis orbiculatis ; aculeis rectis s. paullo 
curvatis intertextis albidis ; radiantibus 16-30 summis paullo longioribus, centralibne 3-4, inferiore robustissimo sub- 
ulato porrecto, superioribus 2-3 et cum radiantibus erectis ; floribus magnis. 
With the former. — Plant 1}-2} inches in diameter ; tubercles 5-6 lines long; lower and lateral spines 4-6, 
upper ones 6-10 lines long; upper central spines of the same length, and the lower central one a little shorter. This 
last one is unusually stout, subulate from a very thick base, and perpendicular on the centre of the plant, which gives 
it a very peculiar aspect. Flowers apparently about 14 or 2 inches long. 
