1010 VERBENACEAE 



11. Verbena littoralis H. B.K. Annual, finely pubescent above, the hairs stiff, not 

 spreading. Stems 6-10 dm. tall, rather sparingly branched : leaf-blades lanceolate to 

 elliptic or linear-oblong, 3-8 cm. long, sharply serrate from below the middle to the 

 apex, sessile : spikes dense, 1.5-3.5 cm. long, less than 5 mm. thick, in corymbose cymes 

 but not crowded : calyx minutely pubescent, becoming 3.5 or 4 ram. long ; lobes acumi- 

 nate : corolla pubescent ; tube about A longer than the calyx ; limb 2.5 mm. broad : nutlets 

 1.5 mm. long, glabrous. 



In waste places, North Carolina to Florida. Naturalized from Mexico and South America. Summer. 



12. Verbena Bonari^nsis L. Annual, villous-hirsute above. Stems 6-12 dm. tall, 

 branching above: leaf-blades oblong to oblong-lanceolate, 4-10 cm. long, serrate with 

 broad teeth or nearly entire below the middle, partly clasping: spikes 0.5-2.5 cm. long, 

 about 5 mm. thick, in rather compact cymes : calyx delicately pubescent, becoming 3-3.5 

 mm. long ; lobes acute : corolla pubescent without ; tube nearly twice as long as the calyx ; 

 limb 2 mm. broad : nutlets about 2 mm. long, glabrous. 



In waste places and shaded banks, South Carolina. Native of South America. Spring and summer. 



13. Verbena venosa Gillies & Hook. Annual, finely pubescent. Stems 2-6 dm. 

 tall, rather widely branched above : leaf- blades oblong or oblong-lanceolate, 4-12 cm. long, 

 acute, sharply and coarsely serrate, sessile and more or less clasping, nerves conspicuous, 

 impressed above, prominent beneath : spikes narrowly cylindric, becoming 2-5 cm. long : 

 calyx becoming 4-5 mm. long ; lobes very short, unequal : corolla lilac or bluish, pubes- 

 cent ; tube fully twice as long as the calyx ; limb 6-7 mm. broad. 



In waste places, near Houston, Texas. Naturalized from South America. Summer. 



14. Verbena N^o-Mexicana (A. Gray) Small. Annual or perennial, canescent- 

 hirsute. Stems branched at the base ; branches 1-3 dm. tall : leaf-blades firm, 1-5 cm. 

 long, ovate to linear in outline, coarsely toothed, incised or pinnatifid, with broadly 

 margined bases, prominently nerved beneath : spikes interrupted, conspicuously bracted : 

 corolla purple or whitish ; tube slightly surpassing the calyx ; limb about 4 ram. broad : 

 nutlets linear-oblong, 2 ram. long, strongly reticulated except at the base. 



In dry soil, Texas and New Mexico. Spring. 



15. Verbena bracteosa Michx. Annual or perennial, hirsute. Stems branched at 

 the base ; branches prostrate or procumbent, 1-5 dm. long, more or less branched : leaf- 

 blades pinnatifid, 1-6 cm. long, prominently nerved beneath in age : spikes conspicuously 

 bracted, continuous or nearly so : bracts much longer than the calyxes : calyx bristly, 

 becoming 3 mm. long ; lobes acute : corolla purple or bluish ; tube about twice as long as 

 the calyx ; limb about 2 mm. broad : nutlets linear, 2 ram. long, strongly reticulated. 



In waste places and on prairies, Minnesota to British Columbia, Georgia, Florida, Texas and Cali- 

 fornia. Spring and summer. 



16. Verbena Tamp^nsis Nash. Perennial, glabrate or strigillose. Stems often 

 branched at the base, the branches 1-6 dm. long : leaf-blades ovate to oblong, 2-8 cm. 

 long, coarsely serrate or incised, cuneate at the base : spikes 2-10 cm. long, at length inter- 

 rupted : bracts about J as long as the calyxes : calyx 12-15 ram. long ; lobes subulate, 2-4 

 mm. long: corolla purple; tube pubescent without and at throat, 1.5 cm. long; limb 

 10-13 mm. broad : anthers without glands on the connective : nutlets 4 mm. long, ridged, 

 enlarged at the base, pitted above the middle. 



In sand, peninsular Florida. Spring to fall. 



17. Verbena ciliata Benth. Mainly perennial. Stem branched at the base, the 

 branches 5-20 cm. long, hirsute : leaf -blades 1.5-3 cm. long, once or twice 3-cleft or parted, 

 the segments narrow : calyx becoming 7 or 8 mm. long ; lobes subulate : corolla 10-15 mm. 

 long ; tube about J longer than the calyx ; limb 7-8 ram. wide : nutlets fully 3 mm. long, 

 strongly wrinkled. 



On plains or dry hills, Colorado to Texas and Mexico. Spring to fall. 



18. Verbena pumila Eydb. Similar to V. ciliata in habit. Leaf-blades typically 

 less deeply and less finely cut : calyx becoming about 6 mm. long ; lobes subulate : corolla 

 8-10 mm. long ; tube slightly longer than the calyx : limb 3-4 ram. wide : nutlets barely 

 3 rara. long, wrinkled. 



In dry soil, the Indian Territory and Texas. Spring and summer. 



19. Verbena bipinnatifida Nutt. Perennial, sometimes flowering the first year. 

 Stems often branched at the base, the branches 1-4 dm. long, hirsute : leaf-blades 2-5 era. 

 long, bipinnately parted, and often primarily 3-divided, the segments typically linear : 

 calyx becoming 9 or 10 mm. long ; lobes setaceous-tipped, surpassed by the bracts': corolla- 

 limb 7-9 mm. wide : nutlets 3 ram. long, prominently wrinkled above. 



On plains or in dry ground, South Dakota to Louisiana, Texas and Mexico. Spring and summer 



