NEW SPECIES FROM MEXICO. 155 
toothed: cymes 2, divergent on elongated naked peduncles, 
repeatedly dichotomous, compact in flower, perhaps loose in 
age; bracts slender, ciliolate-scabrous: corolla salverform, 
rose-colored. 
ACHETOGERON FonnERr Perennial: stem a foot or some- 
what more in height, erect, simple, leafy and monocephalous, 
producing, from near the ground, two or three slender leafy 
stolons a few inches long: plant seabrous-puberulent through- 
out: leaves an inch long, linear-oblong, entire, obtuse, sessile 
and somewhat clasping : head }—14 inches broad: bracts in 
more than one series, but all about equal: rays 50—70, ap- 
parently dull white with a purplish tinge: pappus in both 
ray- and disk-flowers nearly obsolete, consisting of a minute 
crown of short scales more or less joined at base. 
GENTIANA ( GENTIANELLA) SUPERBA. Proper stem only 1—3 
inches high, bearing 1—3 erect seapose peduncles 10—12 
inches long: plant glabrous and somewhat glaucous: leaves 
few, comprised in a radical whorl and 2—3 approximate 
pairs, the radical obovate-spatulate, obtuse, the cauline ovate- 
lanceolate, acutish, all 1—14 inches long: peduncles stoutish, 
acutely angled: calyx 14 inches long, cleft below the mid- 
dle, the 4 segments ovate-lanceolate, acuminate, carinate, 
nearly equal: corolla 2—2} inches long, cleft below the mid- 
dle, the spreading limb 2 inches broad ; segments spatulate- 
oblong, deeply fringed down the sides, erose-dentate around 
the rather obtuse apex. 
The Mexican species of the Gentianella group are difficult 
of definition, but the present plant is well marked in habit, 
and the broad corollas, if blue or purple (sadly faded in all 
the specimens), must render this the most showy of gentians. 
Most of the specimens are simple and 1-flowered. 
LrrHosPERMUM TUBULIFLORUM. A foot high from a peren- 
nial root, sparingly pubescent with soft appressed hairs, the 
leaf-margins pilose toward the base: leaves an inch long, ses- 
