\ 
1136 VERBENACEAE 
IIl. OFFICINALES 
eu coarsely hirsute: flowers approximate in the spi ik 
p usuall cr 6 mm. wide: leaf-blades sessile 
or very short wing-petioled. 7. V. Xutha. 
Stem glabrous or glabr NS flowers widely separated in the 
spike: corolla-limb usually 6 mm. wide or less: leaf- 
^ blades distinctly petioled 
Leaf-blades with blunt, rounded, or abruptly acute tips. 
rolla-limb about 5-6 mm. wide: nutlets fully thrice 
as long as thick. 8. Y. Halei. 
e D 3—4 mm. wide: nutlets twice as long as 
9. V. officinalis. 
riparia. 
Leaf-blades with long-tapering acute tips: 10. Y. 
III. BRACTEOSAE 
Annual plants, often forming mats: spikes leafy-bracted. 11. V. bracteosa. 
I ONARIENSES 
Leaf-blades sessile: nutlets reticulate at the top 12. V. brasiliensis. 
Leaf-blades clasping: nutlets reticulate to below the middle. 13. V. bonariensis. 
V. VEN 
Stems rigid from mote rootstocks : ed NN saliently 
toothed, conspicuously veined. 14. V. rigida. 
1. V. stricta Vent. Perennial, 2-12 dm. tall, densely pale- pubescent: leaves 
3-10 em. long; blades suborbieula r, oval, or elliptic, serrate or incised: spikes 
ong: caly 
and Ont, Introduced E—Sum.—fall. 
2. V. ata L. Do s bur tall, 
syne ule: diem leav 4-14 long: 
lades lan er elliptic- a Or 
ovate-lanceolate, sharply serrate and often 
incised or hastate at the base: spikes rela- 
C 
3.5 wide: nutlets linear, 1.5-2 a 
a -VERBENA. \—Moist fields oa “meadows, various provinces, Fla. to 
N . ©., Ont., and N. §.—Sum 
3. V. angustifolia ee Perennial, 1-5 dm. tall, puberulent or sparingly 
pubescent: leaves 2-12 cm. long; blades linear- Mena ate to e ear- Eds Or 
linear, distantly or d serrate: ae pd calyx becoming 4 
long: corolla deep lavender or purple; limb 5-6 mm. wide: Rr e 3 m mm 
long o ad and roadsides, various DURS Fla. to Ark., Minn., and 
Mass.—Spr.- 
4. V. littoralis H.B.K.  Perennial, 3-10 dm. a a, ee pubescent: 
leaves 2-8 cm. long; blades spatulate, or on shoo oe Ed elliptic 
elliptic- lanceolate, serrate: spikes slender: pou bee us 
to , long: 
eorolla light-blue P limb about 3 mm. wide: AUR bodie ‘Linear, 
fully 1.5 pu edt Dry soil, along s and ene La. Nat. of S. quee 
Spr.-sum. 
5. V. urticaefoli or perennial, 4—15 dm. tall, n beds 
8-21 cm. long; blades broadly ym ua to ovate- lanceolate, or sometim ida 
to oval, coarsely crenate-serrate: spikes loosely-fruited: calyx becomin a oe 
