52 BOTANY OF DR. A. WISLIZENUS’S EXPEDITION 
with a stouter one projecting from their centre.2!_ I have all of these in cultivation, but [105 (21)] 
have not seen as yet flowers or fruit from any of them; still they cannot but belong to 
my genus Echinocereus, to judge from analogy. 
Some Mamillarie of Cosihuiriachi are distinguished by their compact shape; the tubercles are 
very short, globose, or even hemispherical, the spines strong, numerous, radiating, and adpressed, the 
fruits central from a woolly vertex: Mamillaria compacta. Another, M. gummifera;,® belongs, 
together with two species from Texas and from the mouth of the Rio Grande, to the section Angu- 
lares, with pyramidal 4-angled tubercles, and milky juice, which, hardening, forms a gum. A third 
species belongs to Crinite, and is a most elegant little plant with numerous hair-like 
radiating, and one stout, hooked, central spine ; I have named it IM. barbata.2* The speci- [106 (22)] 
men communicated by Dr. Wislizenus, the only one found, was dead when it arrived here, 
but many fruits were adhering to the plant, and I was thus fortunate enough to cultivate it from 
the seeds. 
Other remarkable Cactacee from the State of Chihuahua, which have been commu- 
nicated to Dr. Wislizenus by Mr. Potts, of Chihuahua, are not described here, as it is believed 
that Mr. Potts has sent them already to England, where no doubt long before this, they have been 
published. 
Amongst the other distinguished plants of Cosihuiriachi and Llanos, I cannot omit to mention 
a beautiful Delphinium,® which grew abundantly here; a Silene, which is perhaps new, but comes 
near to S. multicaulis, Nutt., of the Rocky mountains, and S. Mociniana, DC., of Mexico; a new 
HINOCEREUS RUFISPINUS, Nn. sp.: elongato-ovatus, 11-costatus ; areolis elevatis lanceolatis, approximatis, 
ae albido-villosis ; aculeis radialibus 16-18, demum adpressis, intertextis ; 3-5 superioribus setaceis, brevibus, 
albidis ; lateralibus elongatis fuscis, recurvis, ceaiteals singulo, robusto, fusco, porrecto. 
Cosihuiriachi. — Stem 4 inches high, below 2} in diameter; upper radial periit or bristles 1 to 2, lower about 4, 
and lateral 7 to 9 lines long; central spine much stouter, 1 inch lone, 
82 MAMILLARIA COMPACTA, n. sp.: simplex, hemispheerica, s. dentiedglohates tuberculis abbreviatis, ovoideo- 
conicis, suleatis ; areolis ovato-lanceolatis, junioribus albo-tomentosis ; aculeis omnibus radialibus, 13-16 subsequalibus, 
robustis, recurvatis, adpressis, intertextis, albidis, superioribus apice fuscis; sulcis tuberculorum axillisque junioribus 
et vertice tomentosis; floribus in vertice congestis ; baccis ellipticis perigonio coronatis, viridibus ; seminibus obovatis, 
leevibus, fulvis. 
Cosihuiriachi. — Plant 2 to 3} inches in diameter and 1} to 24 inches high ; tubercles in 13 rows, 4 lines high, 
6 = wide at base ; spines interlocking, and thereby often deformed and twisted, stout, 7 to 10 lines long. 
88 MAMILLARIA GUMMIFERA, n. sp.: lactiflua, simplex, hemispherica, tuberculis quadrangulato-pyramidatis ; 
axillis areolisque junioribus albo-tomentosis ; aculeis rectis, radialibus 10-12, inferioribus robustis, apice fuscis supe- 
riores setaceos albidos ter superantibus ; centralibus 1-2 robustis, brevibus, fuscis, porrectis 
Cosihuiriachi. — From 3 to 5 inches in diameter, 24 to 4 inches high ; when Meanie’ it exudes a milky fluid, 
which, hardening, forms a transparent or whitish gum; tubercles mostly i in 13 oblique rows, 6 to 7 lines long, and 
5 to 6 lines wide at base; upper spines 2 to 3, lower 6 to 7, central about 2 lines long. Flowers and fruit not seen, 
but probably like those ‘of two similar species, M. applunata, Engelm. ined., from the Pierdenales, in Texas, and 
M. hemi. Im. ined., from the mouth of the Rio Grande ; both are abso simple, lactescent, with pyramidal 
tubercles, sesh both have ‘aul reddish white flowers, and long clavate scarlet berries, without the remnants of the 
flower. It is a fact which I have repeatedly observed, and in a considerable number of species, that the red (globose, 
or clavate) berries of the Mamillarie are always destitute of the remnants of the perigone, etc.; but the (oval) greet 
fruits always are topped with it. 
** MAMILLARIA BARBATA, n. sp.: simplex, globoso-depressa; tuberculorum axillis nudis; aculeis radialibus 
numerosissimis pluriserialibus, exterioribus piliformibus albis sub-40; interioribus panlo stationed fulvis 10-15, 
centrali singulo robusto, uncinato, fusco, erecto; baccis oblongis, viridibus, apice floris rudimento coronatis. 
Cosihuiriachi. — The only specimen seen was about 2 inches in diameter; tubercles 4 lines long; spines 3 to 4 
lines in length ; fruit 5 to 6 a long, in a circle around the younger iuberehes2 secds obovate scrobiculate, dark 
brown, minute. 
% DELPHINIUM WISLIZENI, n. sp.: perenne, erectum, simplex, glabrum; petiolis clongatis, infimis basi dilatatis ; 
