100 PROCEEDINGS OF THE AMERICAN ACADEMY. 
rowed below the middle into a winged petiole continuous about the stem, 
pubescent on both surfaces, 3-nerved, paler and conspicuously reticulate- 
veined beneath: inflorescence a terminal flat-topped cymose corymb: 
heads 1 to 1.5 em. high, 2 to 2.5 cm. in diameter when fully expanded : 
involucre 2-seriate ; outer scales of the involucre foliaceous, ovate, 1 to 
1.5 em. long, two-thirds as broad, acute or slightly acuminate-acute, 
pubescent with crisp hirsutish hairs; inner scales of the involucre 
smaller, externally pubescent with glandular and hirsute hairs inter- 
mixed, more or less surrounding the glabrous ray-achenes: ray-flowers 
subbiseriate ; rays small, inconspicuous, yellow: disk-flowers numerous ; 
corolla-tube long, slender, externally pubescent, ampliated above into 
an elongated campanulate limb: achenes smooth and glabrous, slightly 
obovate-obliqne, and more or less angular. — Costa Rica. anta- 
tions de mais du Copey, April, 1898, Ad. Tonduz, no. 11,947 (hb. Gr., 
& hb. Inst. Phys.-Geog. Cost. Ri.). 
In general habit this species closely resembles the genus Polymnia, 
and more particularly P. edulis, Wedd., but the involucral characters and 
the perfect disk-flowers place it readily in the genus Rumfordia. 
MonranoaA MACROLEPIS, Rob. & Greenm. Proc. Am. Acad. xxxili. 
44, & xxxiv. 512. Polymnia Liebmannii, Schz. Bip. ace. to Klatt in 
Leopoldina xxiii. 89 (reprint, p. 2). A fragment and a good drawing 
of the original or type of Polymnia Liebmannii, collected by Lieb- 
mann at Cumbre de Estepa, Mexico, show very distinctly that the 
‘plant has its affinity rather with Montanoa than with Polymnia, and 
moreover is identical with the above species Montanoa macrolepis, 
Rob. & Greenm. . 
GYMNOLOMIA MICROCEPHALA, Less., Linnea, vy. 153. In the original 
description of this species it is stated that the heads are discoid, but an 
examination of the type specimen shows the heads to be distinctly radiate. 
A comparison of the type of Gymnolomia patens, Gray, with the original 
of G. microcephala, Less., also shows that the two plants are absolutely 
identical. The combination made by Dr. Gray thus becomes a synonym, 
and the varieties now under G. patens should be transferred to G. micro- 
cephala, Less., hence the synonymy briefly stated is as follows: 
GYMNOLOMIA MIcROcEPHALA, Less., l. c. G. patens, Gray, Proc. 
Am. Acad. y. 182; Hemsl. Biol. Cent.-Am. Bot. ii. 163; Rob. & 
Greenm., Proc. Bost. Soc. Nat. Hist. xxix. 94, incl. synonymy. 
Var. abbreviata, Rob. & Greemn. G. patens, var. abbreviata, Rob. 
& Greenm., Proc. Am Acad. xxix. 887; Proc. Bost. Soc. Nat. Hist. 
xxix. 94. 
