Robinson and Greenman—Genus Lamourouwia. 171 
== Calyx less irregular: lobes usually broad, ovate or oblong, obtusish, or in 
the first linear-oblong and acutish. 
8. L. exserta. Puberulent: stem subtetragonal, copiously 
branched above: leaves narrowly lanceolate, rply serrate, 
acute to acuminate, 1 to 24 inches long, 3 to 5 lines broad, nar- 
rowed at base to slender petiole: racemes lax and secund; pedi- 
cels 2 to 4 lines long: calyx glabrous, 4 to 6 lines in length; the 
cent: stamens conspicuously exserted.— Valley of Mexico, Bour- 
geau, 986, Schaffner, 367; and in rich ravines of Sierra de Clavel- 
linas, Oaxaca, altitude 9,000 feet, 18 October, 1894, Pringle, 4995 ; 
also on top of Sierra Madre near Chilpancingo, altitude 9,000 to 
10,200 feet, 24 December, 1894, Welson, 2216, and at Tlalixtaquilla, 
Nelson, 2261. : 
- L. pepenpENs Benth. Hirsute: leaves ovate-lanceolate: 
calyx-lobes i 
celed, 1} inches long: flowering branches pendulous.—Benth., 
c., 539.—“ Guatemala, Skinner.” Ghiesbrecht’s 74, 173, 176, 
and 706 from Chiapas may be doubtfully placed here, and J. Don- 
nell-Smith’s 2162, which we have not seen, has also been referred 
to this species, Poa 
_ 10. L. wacranrua Mart. and Gal. Pubescent with soft spread- 
ing articulated hairs: stem rather stout, erect from a some 
cccumbent base: leaves ovate, subsessile, doubly and rather 
jo altitude, on Sierra de San Felipe, Oaxaca, ; 
vege 1070, 1343. Originally collected in Orizaba by Galeotti. 
With flowers much shorter, 14 to 14 inches long: inflorescence 
pb] 
t § Hemtspapon Benth. Fertile stamens only 2, or the pos- 
“rior pair at least much shorter and with reduced anthers. 
* Leaves ovate or oblong, broad at base, sessile or nearly so; Mexican and Central 
Ameri ies. 
+ Some or all of the calyx-lobes serrate. 
ss 12. L. Rurwantuiroria HBK. Leaves very sharply and doubly 
teh flowers not densely aggregated : tube of the calyx short, 
8 mpanulate, obscurely 2-3-nerved at each sinus.—Nov. Gen. et 
se N, 337, t. 169.—Common: San Luis Potosi, ht 
5 BP arry and Palmer, 686; Valley of Mexico, Bourgeau; 41m- 
