OF ARTS AND SCIENCES. 117 
THELYPODIUM LONGIFOLIUM, Wats. Rich ravines, Mt. Orizaba, 
10,000 ft., August (no. 250). The radical leaves are not present in 
the type of this species, and later specimens in the Gray Herbarium 
also lack them. ‘The Mt. Orizaba specimens show them to be about 
an inch long, narrowly spatulate, obtuse, sparingly toothed at the apex, 
and very hispid with stellately branched hairs. 
CeRASTIUM ORITHALES, Schl. (Linnwa, XII. 209). Pine woods, 
Mt. Orizaba, 13,000 ft., August (no. 236). A very handsome species, 
well characterized by its simple stem and large flowers. 
CrRASTIUM VOLCANICUM, Schl. (Linnxa, XII. 208). Pine forests, 
Mt. Orizaba, 11,000 ft., August (no. 213). The specimens referred to 
this species have the petals but slightly cleft. The species is a prom- 
inent element of the herbaceous flora at an altitude of 11,000 feet. 
ARENARIA seRPENS, HBK. In pine woods, Mt. Orizaba, 13,000 
ft., August (no. 234). As defined by Rohrbach (Linnea, XXXVI 
268), many forms are included under this species. The Mt. Orizaba 
specimens, which seem best placed here, are closely related to A. 
Bourgei, Hemsl., but differ in the spatulate leaves and in the petals 
only equalling or little exceeding the sepals. 
Drymaria FILIrorMis. Glabrous throughout, 3-8 inches high: 
stems erect or spreading from a slender rootstock, much branched, 
filiform, somewhat rigid: leaves thickish, short-petioled, ovate to lan- 
ceolate, narrowed at the base, 2-2} lines in length, reduced to ovate 
bracts above: stipules setaceous: flowers slender-pedicelled, disposed 
in a diffuse cyme: sepals ovate, obtuse, herbaceous, scarious-margined, 
with a dark tip or midnerve, somewhat carinate, a line long: petals 
deeply cleft, shorter than the sepals: capsule globose, shortly stipitate, 
many seeded. — Barren slopes, Mt. Orizaba, 9,000 ft., August (no. 
267). Resembling D. anomala, Wats., in habit, foliage, and somewhat 
in the inflorescence, but differing in the slender rootstocks, glabrous 
obtuse sepals, and much longer-pedicelled flowers at the nodes of the 
branches. 
AsTRAGALUS (MoLtitssim1) Or1zaABm. Stem decumbent, branched, 
clothed with a short white tomentum, a foot or less high: leave 
including petiole 4-6 inches long; leaflets 14-17 pairs, petiolulates 
oblong-lanceolate, obtuse or acutish, somewhat cuneate at the base, 
lines in length, white sericeous-pubescent : stipules narrowly deltoid, 
acuminate, 2-2} lines long: peduncles shorter than the leaves: 
racemes oblong, 14-2} inches in length: bracts linear-lanceolate, 1} 
_ lines long, exceeding the pedicels: calyx sericeous-pubescent, 3-4 lines 
in length, the linear acuminate teeth three fourths as long 4s the 
