174 MISSOURI BOTANICAL GARDEN. 
A. Bracts longer than one-half ovary; corolla about 1.5 cm. long, 
tube distinctly gibbous, as long as limb. 
B. Leaves all distinct, petioled and never stipulate, oblong to oval, 
obtuse, coriaceous, dark green and glabrous above, grayish 
tomentose beneath, rarely glabrous, 2-4 cm. long; flowers in 
often panicled, pubescent spikes, usually only two opposite 
flowers in a whorl; corolla 12-15 mm. long, pubescent outside, 
yellow. 137. L. subspicata, Hook. & Arn. 
Bo. At least the uppermost pair of leaves connate into a disk, rarely 
all distinct. 
C. Leaves orbicular-obovate to oval, obtuse, 2-4 cm. long, 
rounded or broadly cuneate at the base, glabrous, rarely 
somewhat pubescent, never stipulate, subcoriaceous; 
spikes glabrous, ‘with numerous remote whorls, often 
panicled; corolla 12-15 mm. long, glabrous without, 
yellow. 188. L. interrupta, Benth. 
CC. Leaves ovate to ovate-oblong, acutish, or obtuse, usually 
cordate at the base, 2.5-8 cm. long, glabrous or pilose, the 
middle ones usually with stipular appendages; flowers in 
mostly short spikes; corolla 15-18 mm. long, usually pink 
or purplish, pilose without or glabrous. 
139, L. hispidula, Doug]. 
AA. Bractlets shorter than one-half ovary, usually minute; corolla 
1.5-3.5 cm. long; the pair of leaves below the inflorescence always 
connate. 
B. Corolla 1.5-2.5 cm. long, rarely longer, hairy within. 
C. Disk of connate leaves orbicular to oblong, pointed and 
acute or mucronate at the ends, rarely obtuse, concave. 
D. Leaves glabrous, or pubescent only beneath, not ciliate 
(except in a var. of ZL. albiflora); corolla glabrous or 
sparingly pilose without. 
E. Tube of corolla slender, slightly ventricose below 
the middle, usually longer than the limb; inflores- 
cence sessile or nearly so; style and filaments 
glabrous, rarely pilose. 
F. Leaves ovate or oval, 2-3 cm. long, glabrous or 
pubescent; one or two sessile whorls; corolla 
yellowish-white, 1.5-3 cm. long, glabrous or 
pilose without. 
140. ZL. albiflora, Torr. & Gray. 
FF. Leaves oblong to oblong-lanceolate, 5-8, rarely 
but 3-4 cm. long, glabrous or nearly so; 
inflorescence very short-peduncled, consist- 
ing of several whorls or rarely but one; 
corolla yellow, 2-2.5 cm. long, glabrous with- 
out. 141. LZ. Yunnanensis, Franch, 
EE. Tube of corolla gibbous; corolla often tinged pur- 
ple; inflorescence short-peduncled. 
