OF ARTS AND SCIENCES. 169 
small, filiform. This genus appears most closely related to Ligus- 
ticum, differing from it chiefly in the more slender conical stylo- 
podia, solitary oil-tubes, carpels dorsally flattened, and fruit con- 
tracted below. In its habit and lax inflorescence it somewhat 
resembles Arracacia, but its much broader commissure and the 
form of the seed would place it rather among the Selinex. I take 
pleasure in dedicating the genus, at the desire of the discoverer, to 
Professor John M. Coulter, who with Mr. J N. Rose has so care- 
fully elaborated the North American species of this difficult order. 
To Mr. Rose I am indebted for kind assistance in determining the 
generic affinities of the plant here described. 
C. raxum. Stem somewhat woody, 5-10 feet high, an inch in 
thickness, with prominent nodes: leaves bi- or tripinnate, 18 inches 
in length, with enlarged sheathing petioles; leaflets ovate or ovate- 
lanceolate, serrate, acuminate at the apex, rounded at the base, 
almost smooth above, pubescent on the veins beneath with minute 
stiff hairs: inflorescence lax, several times branched, branches 
bearing compound umbels with 6-12 rays: bracts of the involucre 
1-4, sometimes wanting, short, filiform; bractlets similar, usually 
more numerous: fruit 4 lines long; the contracted base a line in 
length: flowers not seen. — Bluffs of barranca near Guadalajara, 
September, 1891 (n, 3831). ; 
OtpENLANDIA PringieI. Cvspitose: stems ascending or pros- 
trate, subsimple or considerably branched, usually springing from 
elongated scaly rhizomes: leaves pseudo-verticellate, in groups of 
4-8, linear, acute, appearing somewhat fleshy: flowers borne in 
rather loose terminal cymes: pedicels 1-3 lines in length: corolla 
salver-formed, 4-lobed, 2-2} lines long, purple in a dried state: 
stamens and pistil dimorphous; anthers either inserted on the 
middle of the tube or just exserted from its summit: ovary entirely 
inferior, crowned in fruit by the lanceolate approximate calyx 
teeth; these almost equalling the capsule in length: seeds smooth, 
numerous, obtusely angulate, not concave.— Alkaline plains, Ha- 
Cienda de Angostura, San Luis Potosi, June, 1891 (n. 3758). A 
Plant of almost equal affinity to Oldenlandia and Houstonia, pos- 
Sessing the numerous small angulate smoothish seeds and entirely 
Inferior ovary of the former, but the dimorphous flowers and linear 
anthers of the latter. | | . 
CrusEA mecanocarpa, Wats (P. A. A., XXV iF get ee : 
megaloca Gray (Ibid., XXI. 381). r. Pringles 
fag aan ol characters, 
macoce 
Specimens of this species being in flower, the floral ch u 
