166 PROCEEDINGS OP THE AMERICAN ACADEMY 



rowly oblong or lanceolate, some rounded at the apex, others acute . 

 rays 12 to 25, little exceeding the disk; pappus of two very unequal 

 awns, the inner more than half as long as the achene, the outer much 

 shorter ; achenes smooth, with a single rib on each face, edges acute, 

 the outer usually wingless, the inner with a narrow wing, which ex- 

 tends up upon the inner awn and there broadens into an auricular 

 appendage. — Limestone liills, San Jose Pass, San Luis Potosi ; Oc- 

 tober, 1890 (n. 3310). From its peculiar pappus with wing-appen- 

 dages this plant must be referred to the genus Otopappus as extended 

 by Herasley (Biol. Cent. Am. Bot. 2. 191), and placed near 0. epale- 

 aceus, Hemsl. The whole habit of the plant with its alternate leaves 

 is that of a Verbesina, and it seems thus to connect the two genera, 

 especially since there are several species of Verbesina, as V. Hum- 

 boldtii, Spreng., and V. perymenoides, Schultz Bip., in which the 

 achenes are more strongly winged on one side than on the other. 



Senecio Guadalajarensis. Herbaceous; stem erect, leafy, sul- 

 cate-striate, smooth : leaves elongated lanceolate, 6 to 8 inches long, 

 9 to 15 lines broad, acute, narrowed at base to a very short naked 

 petiole, pinnately veined, callous-denticulate and minutely ciliate, cori- 

 aceous, glabrous on both sides except the veins beneath, the upper 

 surface green, covered with lighter-colored warty blotches (pathologi- 

 cal ?), the lower surface very glaucous : corymb ample, with rather 

 numerous medium-sized heads; scales of the involucre about 10, 

 strongly carinate, acutish, 4 lines long : rays about 5, rounded at the 

 apex ; teeth of the disk-corollas exceeding the short campanidate 

 throat and half the length of the slender tube proper: achenes ribbed, 

 puberulent. — Rich slopes of barranca near Guadalajara, Jalisco ; Sep- 

 tember, 1890 (n. 3280). 



Laurentia ovatifolia. Annual, 6 to 12 inches high, puberu- 

 lent ; stem slender, flexuous, angled, subsimple or branched above : 

 leaves petiolate, ovate, acute, abrupt or subcordate at base, finely and 

 regularly serrate, about an inch long, two thirds as broad, the lowest 

 smaller, rounder, obtuse, the upper lanceolate ; petioles 3 to 5 lines 

 long; pedicels filiform, cui-ving upward, 9 to 12 lines long, two to four 

 times longer than the linear-filiform bracts : flowers small, racemose ; 

 calyx-tube hardly any, the lobes linear, acute, not quite equalling 

 the corolla-tube ; corolla 2 lines long, the nearly white tube split 

 half-way to the base behind; limb blue, with very dissimilar lobes, 

 the three lower obovate, somewhat united to form a spreading lip, the 

 two upper erect, contracted to narrow points : stamens inserted near 

 the middle of the tube, the two smaller anthers peuicillate : capsule 



