ROBINSON, — GALINSOGA. 325 
hirsute-pubescent upon both surfaces; the central lobe lanceolate 
attenuate to a sharp point, 3-nerved, 1}-24 inches long, 3-7 lines 
broad; lateral lobes 6-8 lines long, somewhat falcate, obtuse; the 
uppermost leaves reduced, entire; petioles 4 inch long: staminate 
racemes slender, loosely flowered, including the peduncle 2-4 inches 
long: pedicels } line long, equalling or somewhat exceeding the minute 
subulate bractlets : perianth 14 lines broad; segments of two forms; 
the 3 outer spreading, oblong, obtuse; the inner a little narrower and 
acutish, ascending, incurved: stamens 3, very short, perhaps one third 
as long as the segments of the perianth: fruiting raceme 14-2 inches 
long upon peduncles of nearly equal length: capsules glabrous, re- 
flexed, somewhat imbricated, elliptic in outline, 6 lines long, half as 
broad. — Collected upon the steep sides of wet cliffs of the barranca 
of Guadalajara, 8 September, 1893 (no. 5434). 
II.—NOTES UPON THE GENUS GALINSOGA. 
Few genera have been subject to so much doubt as to proper lim- 
itation as Galinsoga. This is equally evident from its treatment in 
De Candolle’s Prodromus, in which of its supposed six species five 
are questioned, and from the writings of subsequent authors who have 
dealt with it. Satisfactory generic limitations can perhaps only be 
obtained by a monograph including not only the plants hitherto as- 
cribed to Galinsoga, but several neighboring genera, for which suffi- 
cient material could only be found in the larger foreign collections. 
Something, however, may well be done at more accurate specific and 
Varietal definition of forms growing within our own country. So far 
as I know, only one species is at present recognized upon the continent 
of North America north of Mexico, that is G. parviflora, Cav. The 
telling characteristics of this species, when obtained from the earliest 
descriptions and figures as well as from the examination of material 
completely in accord with these, are as follows: stem and branches 
Smoothish or finely and more or less appressed pubescent : rays white or 
whitish, little exserted : pappus of the disk flowers consisting of spatulate 
obtusish scales equalling the achene. Of this species several varieties 
have been Suggested. Dr. Gray in the Pl. Wrightiana, ii. 98, founded 
‘wo upon the relative development or absence of the pappus in the 
ray flowers ; namely, var. sEMICALVA, with naked ray achenes, and var. 
Caracasana, with abortive ray pappus. The writer has examined a 
large number of specimens of the species both from North America 
and from the most widely separated regions of the world, and finds 
