42, BOTANY OF DR. A. WISLIZENUS’S EXPEDITION 
by the Mexicans, according to Dr. Gregg. The stems of the dead plant present a most singular 
appearance ; the soft parts having rotted away, a net-work of woody fibres remains, forming a hollow 
tube, with very regular rhombic meshes, which correspond with the tubercles of the living plant. 
The first Mamillaria was also met with on Waggon-mound, —a species nearly related to MW. 
vivipara of the Missouri, and also to the Texan JZ radiosa (Engelm. in Plant. Lindh. inedit.), but 
probably distinct from either. Mr. Fendler has collected the same species near Santa Fé. 
On Wolf Creek the curious and beautiful Fallugia paradoxa, Endl., looking like a shrubby 
Geum, was found in flower and fruit; also a (new?) species of Streptanthus, and an interesting 
Geranium, which I named G. pentagynum,® because of its having its five styles only slightly | 
united at base, while most other Gerania have them united for about two-thirds or more [91 (7) ] 
of their length. 
In the prairies about Wolf Creek, in an elevation of between 6,000 and 7,000 fois, the 
smallest of a tribe of Cactacew was discovered, numerous species of which were found in tlie course 
of the journey south and southeast: several others have also been discovered in Texas. I mean 
those dwarfish Cerei, some of which have been described with the South American genus Hchinopsis, 
or have been referred alternately to Cereus or Echinocactus, and which I propose to distinguish from 
all these under the name of Zchinocereus, indicating their intermediate position between Cereus 
and Echinocactus: they approach more closely to Cereus, in which genus they, as well as the genus 
Echinopsis, should perhaps be included as sub-genera. 
The species mentioned above is distinguished from all others known to me by its yellowish 
green flowers, the others having crimson or purple flowers. I have named it, therefore, Echinocereus 
viridiflorus$ 
south only 12 to 20, generally fewer on the under side of the branchlets ; spines horn-colored, with straw-colored loose 
sheaths, from 3 to 10 lines, generally about 6 lines long. Flowers purple, 3 inches in diameter; stamens red ; fruit 
—— 1 inch long, yellow. 
RANIUM PENTAGYNUM, Nl. Sp.: perenne, caule erecto ramoso cum petiolis retrorso-piloso ; foliis strigoso-pubes- 
a inferioribus 7-, superioribus 3-5-partitis, segmentis inciso-lobatis ; pedicellis binis, glanduloso-pubescentibus; 
sepalis glandulosis, aristatis ; petalis basi villo brevi instructis, ad venas pilosiusculis, obovatis integris ; filamentis 
ciliatis ; ovario glanduloso; stylis ima parte solum connatis; capsula glanduloso-pubescente, 
On Wolf Creek, flowers in June. Several stems 1 foot high from a large ligneous rhizoma ; similar to @, macula- 
tum, but easily distinguished from this and most other species by the styles being united only for } or } of their 
length ; flowers of the same size, but aristz of sepals much larger ; leaves only 2 or 24 inches wide.* 
7 EcHINOCEREUS, n. gen. Perigonii tubus ultra germen productus, abbreviatus. Sepala exteriora s. tubi sub- 
ulata, in axillis tomentosis setas s. aculeos gerentes. Sepala interiora subpetaloidea et petala longiora pluriserialia 
corollam breviter infundibuliformem s. sub-campanulatam emulantia. Stamina numerosissima tubo adnata, limbo 
breviora s. eum subsequantia. Stylus stamina vix superans. Stigma multiradiatum. Bacca pulvilligera setosa s+ 
aculeata, perigonio coronata. Seminui testa dura tuberculata nigra. Embryo vix curvatus cotyledonibus brevibus 
contrariis. 
Globose, or mostly ovate ; simple, or mostly branching from the base or cespitose ; tubercles forming few oF 
mostly a great many ribs; Sanches of short or long spines, distant or approximate, often very crowded; vertex never 
woolly; flowers lateral, produced from last year’s growth, opening only in sunshine, but for two or three days in 
puccemion ; closed at night, or in dark weather. 
8 ECHINOCEREUS VIRIDIFLORUS, n. sp.: ovato-globosus, humilis, sub-13-costatus ; areolis lanceolatis, approximatis, 
junioribus villosis ; aculeis 16-18 rectis, radiantibus, lateralibus longioribus fuscis, reliquis albidis, centrali nullo s. 
elongato robusto, apice fusco; floribus lateralibus; tubo pulvillis 25-30 albo-tomentosis setas albas 5-10 gerentibus 
stipato; sepalis interioribus Jineari-oblongis sub-10; petalis 12-15 lineari-oblongis, obtusis; baccis ellipticis virescen- 
tibus, seminibus parvis tuberculatis. 
Prairies on Wolf Creek, flowers in’ June; Santa Fé, flowers in May (Fendler). Body 1 to 1} inch high, oval ; 
spines 1 or 1} to 3 lines long; central spine when present 6 to 7 lines long; flower 1 inch long and wide, outside green 
brown, inside yellowish green ; petals only 2 lines wide, being about 5 lines long. 
* This ‘‘ seems to be Geranium Fremontii (Torr.) of Fremont’s second report,” according to Dr. Torrey, in a note appended 
by Wislizenus ; but in Watson’s Index (p. 151) it is said to be synonymous with @. Richardsoni. — Eps. 
on NS : 
i ae Fe 
