OP ARTS AND SCIENCES. 165 



lets deeply 2-3-parted, the segments ovate or lanceolate, acuminate, 

 more or less narrowed at base, 1 to 1^ inches long, 10 lines or less in 

 breadth, green above, pale beneath, serrate, the margins of the teeth 

 being slightly thickened and cartilaginous ; upper leaves scattered in 

 the diifusely branched inflorescence, pinnately or ternately parted with 

 long linear toothed or serrate segments ; the highest leaves reduced 

 to Hliform bracts ; involucres and involucels none : umbels numerous, 

 with few (2 to 6) often unequal rays 6 to 9 lines in length ; umbellets 

 about 12-flowered, only 2 or 3 flowers in each being fertile: corolla 

 white (?) or in the sterile flowers not infrequently purple : fruit a line 

 long, the ribs not very prominent ; stylopodiura depressed, the margin 

 crenute ; oil-tubes numerous ; inner surface of the seed plane or very 

 shallowly concave. — Hills of Patzcuaro, Michoacan ; November, 

 1890 (n. 3331). 



EuPATORiUM EspiNOSARUM, Gray, var. subintegrifolium. 

 Leaves ovate, acuminate, subentire, very glutinous on both sides : 

 scales of the involucre a little longer and more acute than in the 

 typical form, being in these respects more as in var. amhigimm, Gray. 

 — Shaded ledges of lime-rock, San Jose Pass, San Luis Potosi ; Oc- 

 tober, 1890 (n. 3311). 



Gymnolomia decumbens. Stems several from a ligneous base, 

 decumbent, simple or branched from near the root, smoothish below, 

 roughened above with very short appressed hairs : lower leaves oppo- 

 site, elliptical, acute, narrowed to a sessile base, subentire, thickish, 

 rough-pubescent, green on both sides, \^ inches long by half as broad ; 

 the upper similar but narrower, alternate, sparse : heads terminal, soli- 

 tary or 2 or 3 together; involucre ^ inch in diameter; outer scales 

 ovate, acuminate, very rough, the inner larger, smoother, obtusish ; 

 chaff oblanceolate, acuminate; rays 12 to 15, narrow, over half an 

 inch in length, yellow ; achenes (immature) smooth, angled, and with 

 no trace of teeth or awns. — Rocky hills, Tultenango, State of Mex- 

 ico; September, 1890 (n. 3263). This species resembles G. rudis, 

 Gray, but differs in its decumbent habit, smaller and more entire 

 leaves, smaller heads, ovate not oblong involucral scales, and longer 

 narrower rays. From G. multijiora, Nutt., it differs in the ligneous 

 clearly perennial base, as well as in the involucre, etc. 



Otopappus ALTERNiFOLius. Stem 3 to 6 feet high, striate, smooth- 

 ish or slightly tomentulose : leaves alternate, ovate-lanceolate, acumi- 

 nate at both ends, subsessile, with a short roughish pubescence above, 

 white-tomentose beneath: heads in an open corymb, about 15, half an 

 inch or more in diameter ; scales of the involucre in several rows, nar- 



