FROM MISSOURI TO SANTA FE AND NORTHERN MEXICO. 49 
the largest specimens seen by Dr. Wislizenus, which is one foot high. In this neighborhood 
Opuntia Tuna, Mill., was seen for the first time; and this is perhaps the most northern limit of that 
extensively diffused species, as well as of Agave Americana, another common Mexican plant. Both 
were found in greater perfection near Chihuahua, and from there constantly down to Monterey and 
the mouth of the Rio Grande. The Opuntia appears to extend also high up in Texas, 
Together with these a Dasylirion, perhaps the same as the Texan species, was found here, and 
afterwards again near Saltillo. 
From El Paso to Chihuahua the road lies in part through a dreadfully arid sand- 
hill district, where a peculiar Martynia® was observed, and farther on through a lovely [101 (17)] 
country, which at that season (August), after the annual rains, was covered wit 
luxuriant vegetation. The elevation of the country is here between 4,000 and 5,000 feet above 
the gulf. 
The rare Cevallia sinuata, which Dr. Gregg has also sent from Monterey, was found in this 
part of the journey. Here also occurred a perennial species of Jinwm, with yellow petals, —so far, 
in America, the only perennial yellow-flowering Linwm; it is distinguished by its long aristate 
sepals, whence the name! Several @notherc, not seen before, made now their appearance ; differ- 
ent species of Gilia, a number of Nyctaginew, several <Asclepiadacee, Malvaceae, Cucurbitacee, 
Composite, and others, were here collected ; including a number of new species, which only want of 
time and references have for the present prevented me from describing. Near Lake Encinillas 
another Martynia™ was found, which in its foliage comes nearer to M. proboscidea, but is readily 
distinguished by its purple flowers. A beautiful yellow-flowering bignoniaceous shrub, — probably 
Tecoma stans, Juss.,— seen more frequently farther south, was observed for the first time near 
Gallejo Spring. Shrubby Algarobie were seen more plentifully, as also some other Mimosee. 
Here would be the proper place to introduce a notice of the several species of Yucca found by 
Dr. Wislizenus ; but unfortunately the labels of the specimens were partly lost, so that it is impos- 
sible at this time to arrange leaves, flowers, and fruits properly. Certain it is that several species 
besides Yucca angustifolia, mentioned above, were seen; that the leaves of all of them have fila- 
mentose edges, some with very fine, others with very coarse fibres on their margin; that the ma- 
jority bear juiceless capsules with very thin, paper-like seeds, but that one species produces an 
lower lateral ones slightly compressed 6 to 7 lines long, lowest 5 lines long; central spines nearly as long as the last, 
stouter than the others. From J. pectinatus and £. cespitosus (see note 45), which it resembles, it is distinguished 
by the a not appressed spines, the larger number and size of the central spines, etc. 
2 MARTYNIA ARENARIA, n. sp.: annua, glanduloso-pilosa foliis alternis, longe petiolatis, cordatis, 3-5-7-lobatis, 
lobis rotundatis, repando-denticulatis ; bracteis lanceolatis calycem obliquum, infra fissum, dimidium mquantibus ; 
staminibus 4; rostro pericarpium sequante. 
Sandhills below El Paso, flowers August. Leaves 1} to 2 inches wide and long ; flowers spotted, “ yellow” 
(Dr. A erapet a little smaller than in M. 
21 LINUM ARISTATUM, n. sp.: caulibus e hit ligneo pluribus, ramosissimis, uri, i is sparsis subu- 
acuta, sapatal persistentibus bis teuvines: 
In sandy soil near Carizal, south of El Paso; collected in August, in flower and fruit. The rhizoma in the 
specimen before me is 6 inches long and 3 to 4 lines in diameter, white ; stems numerous, | to 3 feet high, divaricately 
branched ; upper leaves (lower not seen) 3 to 4 lines long; flowers 10 lines in diameter ; sepals 4 lines long ; petals 
cis tren yellow; styles united for about three-fourths of their length ; capsule 2 lines hei: 
#2 MARTYNIA VIOLACEA, n. sp.: annua, foliis alternis, cordatis, repando-sinuatis, cae ak glabriusculis ; ; 
bracteis lanceolatis calyce obliquo, infra usque ad basin fisso, dimidio brevioribus ; staminibus 4 pericarpium 
superante. 
Near Lake Encinillas, north of Chihuahua; flowers August ; leaves 4 to 6 inches long, and nearly as wide, 
indistinetly sinuate-lobed, beset with small, sharp, distant teeth ; flowers from pale red to deep violet purple, as large 
as in M. proboscidea. 
