246 Engelmann and Gray, 



245. Sedum sparsiflorum, 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. Gb. 



" Mr. Lindheimer has sent seven other Cacti, mostly in living specimens, namely : 



1. Opdntia, 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. Missouriensis? Perhaps O. vulgaris, but very spiny. 



3. Mammilaria similis (n. sp.): ea;spitosa ; axillis tuberculorum juniorum 

 paulo tomentosis demum glabris ; tuberculis ovatis supra leviter sulcatis (sulco 

 basin versus subtomentoso) apice spiniferis ; spinis (circ. 12) aqualibus rectis 

 radiantibus albidis, junioribus puberulis basique tomento circumdalis ; baccis 

 sparsis globosis coccineis. — Sandstone rocks, near Industry. Evidently near M. 

 simplex, at least to Nuttall's plant of that name, but cssspitose, 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. sulcata {n. sp.): caespitosa ; 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 

 majore) 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 ; 

 stigmatihus 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 it abundantly 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; aeuleis 15-18 fasciculatis tenuibus flexuosis flavi- 

 canti-fuscis, superioribus 3-5 elongatis, 1-3 centralibus longissimis erectis, cacteris 

 radiantibus ; floribus minutis solitariis e macula subtomentosa supra fasciculos 

 aculeorum ortis ; sepalis in tubum concretis, apicibus liberis late ovatis acuminatis 



scariosis margine fimbriatis ; fruetihus ; seminibus ovatis nigris 



opacis minutim tuberculatis. — Musket-thickets, on the Colorado River. Near 

 E. tenuispinus, Link fy Olio, 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. Flowers about five 

 lines long. 



6. E. Lindheimeri (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 inacqualibus 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 ; 



