38 Engelmann and Gray, 
245. Sepum sparsirLorum, Nutt. Naked places in the 
San Bernardo prairie, between the Brazos and the Colorado. 
April — May. 
any adequate or authentic collection of Cacti, so as to institute the proper com- 
parisons. A. Gr. 
“ Mr. Lindheimer has sent seven other Cacti, mostly in living specimens, namely : 
1. Opuntia, sp. without fruit or flower, probably O. vulgaris. It attains the 
height of several feet, with large obovate joints, and a few spines. 
2. O. Missourtensis? Perhaps O. vulgaris, but very spiny. 
3. MAMMILARIA SIMILIS (n. sp.): cespitosa; axillis tuberculorum juniorum 
paulo tomentosis demum glabris; tuberculis ovatis supra leviter sulcatis (sulco 
basin versus subtomentoso) apice spiniferis; spinis (circ. 12) equalibus rectis 
radiantibus albidis, junioribus puberulis basique tomento circumdatis; baccis 
sparsis globosis coccineis. — Sandstone rocks, near Industry. Evidently near M. 
simplex, at least to Nuttall’s plant of that name, but cespitose, forming tufts often a 
foot in diameter. Flowers not seen. Berries scarlet, of the size of a large pea. 
Seeds numerous, subglobose, scrobiculate, black, with an elongated white hilum. 
I have living plants, but they have not yet flowered. 
4, M. sutcaTa (n. sp.): cespitosa; tuberculis ovato-oblongis sulco subinde 
apicem versus prolifero superne exaratis apice spiniferis ; spinis rectis radiantibus 
cinereis e tomento albido deciduo (in plantis adultis spina centralis subrecurva 
jore) ortis; floribus centralibus fasciculatis e tomento ortis glaberrimis, tubo 
brevi; sepalis lanceolatis acuminatis viridi-flavescentibus margine integerrimis ; 
petalis longioribus lanceolatis apicem versus ciliato erosis cuspidatis sordide flavis 
ad basin intus filamentisque brevibus rubicundis; stylo supra stamina exserto; 
stigmatibus 7-10 flavis; baccis oblongis virescentibus.— With the preceding. 
Flowers opening for two or three days, in direct sunshine, two inches or more in 
diameter. On account of the central flowers, this should form, with M. vivipara, a 
distinct section. From that species itabundantly differs, not only in the color of the 
flower and the spines, but in the entire and smooth sepals, denticulate petals, &c. 
[This pretty species has also flowered in the Cambridge Botanic Garden. ] 
5. EcHINocacTUS SETISPINUS (n. sp.): subglobosus, apice retusus; costis ple- 
rumque 13 acutis subobliquis; aculeis 15-18 fasciculatis tenuibus flexuosis flavi- 
canti-fuscis, superioribus 3-5 elongatis, 1-3 centralibus longissimis erectis, ceteris 
radiantibus; floribus mawetis solitariis e macula subtomentosa supra fasciculos 
aculeorum ortis ; sepalis in tubum concretis, apicibus liberis late ovatis acuminatis 
scariosis margine fimbriatis; fructibus . . . . .3; seminibus ovatis nigris 
opacis minutim tuberculatis. — Musket-thickets, on the Colorado River. Near 
E. tenuispinus, Link g- Olto, from Brazil. Our specimens are about two inches 
in diameter, and an inch and a half high, with pretty sharp ribs separated by 
deep grooves. The longest spines are fifteen lines long. Flowgrs about =fwe- 
lines-long. “i y ' /- Bye be Jee 
6. E. Lrspnermertr (n. sp.): hemispherico-depressus, vertice tomentoso ; costis 
21 verticalibus acutis subundulatis; spinis e cicatrice ovato-lanceolata tomentosa 
ortis fasciculatis compressis cinereo-rubellis transversim annulato-striatis, exteriori- 
bus 6-7 inequalibus radiantibus subrectis centrali recurvata multo brevioribus; 
floribus e vertice depresso tomentoso ex axillis fasciculorum spinarum hornotinorum 
provenientibus confertissimis; sepalis (80-100) in tubum brevem infundibulifor- 
mem lanosum coalitis lanceolatis spinoso-aristatis, interioribus margine fimbriatis ; 
