280 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO MEXICAN SPECIES. 
Leaves very pubescent ........2.2222.......---.----------- T. vestita, 
Leaves quite glabrous or nearly so. 
Leaves sessile. ...2..22.-22--2-2-2--20 222-2222 22 eee eee T. sessilifolia, 
Leaves distinctly petioled. 
Stems roughened ..........2....--2...-------------- T. tuberculata, 
Stems not roughened. 
Glands borne on the petiole near its middle. 
Inflorescence glabrous ..-...........22.---- T. palmeri. 
Inflorescence not glabrous. 
Under surface of leaf more or less pubes- 
cent ...... 2022 eee eee T. hirsuta. 
Under surface of leaf glabrous. ........- T. humboldtiana. 
Glands borne on or at the base of the blade. 
Gland stalked ...........0.....------------ T. humilis. 
(;lands sessile. 
Mature leaves linear to linear-lanceolate. T. linifolia. 
Mature leaves broader than linear. 
Internodes longer than the leaves. 
Petioles nearly glabrous; flowers 
tinged with red........2..-. T. montana. 
Petioles very pubescent; flowers 
tinged with green...........- 
Internodes shorter than the leaves. 
Leaves lanceolate......2.....-. T. gracilis. 
Leaves oblong. . 
Upper leaves acute; inflores- 
— 
| angustifolia. 
cence lax ....2.222.---2- T. glauca. 
All leaves obtuse; inflores- 
cence strict ...2...2.-22- T. multicaulis, 
UNCERTAIN SPECIES. 
T. grandiflora (Bartl.) Kunze. T. latifolia ( Bartl.) Kunze. 
T. glandulosa (Cav.) Kunze. T. paniculata (Bartl.) Kunze. 
Thryallis angustifolia (Benth. ) Rose. 
Galphimia angustifolia Benth, Bot. Sulph 9. pl. 5, 1844. 
This seems to be the common species of the west coast of Mexico, especially of 
Lower California. This species has been confused with G. /inifolia Gray but is 
apparently distinct. Even if the two should be combined 7. angustifolia would be 
the proper name. 
Thryallis glandulosa (Cav. ) Kuntze. 
Thryallis glauca (Cav.) Kuntze. 
Thryallis gracilis (Bartl.) Kuntze. 
Thryallis grandiflora (Bartl.) Kuntze. 
Thryallis hirsuta (Cav.) Kuntze. 
Thryallis humboldtiana (Bartl.) Kuntze. 
Thryallis humilis Rose, sp. nov. 
Low bushy shrub, 30 to 60 cm. high, slightly pubescent; leaves lanceolate, 4 to 7 em. 
long, 2 to 3 em, broad, glabrous, very pale beneath, acute, tapering at base into a 
short petiole, somewhat revolute-margined at least in herbarium specimens, bearing 
a stalked gland on each margin a little distance above the base, but these sometimes 
