548 



CONTEIBUTIONS FROM THE NATIONAL HERBAEIUM. 



.1. Echium vulgare L. Sp. PI. 139. 1753. 



Type locality: "Habitat in Europa ad vias & agros." 



New Mexico: Mesilla {Cockerell). 



A native of Europe, frequently established as a weed in the United States. 



124. VERBENACEAE. Vervairf Family. 



Herbs or shrubs with opposite exstipulate leaves (sometimes apparently fascicled) ; 

 flowers in elongated or contracted bracted spikes, these somewhat elongated in fruit; 

 calyx limb 2 to 5-lobed, sometimes unequally so; corolla mostly 2-lipped, tubular, 

 5-merous; stamens didynamous, epipetalous, alternate with the corolla lobes; style 

 single, with 1 or 2 stigmas; ovary 2 to 4-celled; fruit dry, separating at maturity into 

 2 or 4 nutlets. 



KEY TO THE GENERA. 



Fruit of 4 nutlets 1. Verbena (p. 548). 



Fruit of 2 nutlets. 



Shrubs , aromatic ; spikes elongated 2. Lippia (p . 550). 



Herbs, odorless; spikes contracted, headlike 3. Phyla (p. 550). 



1. VERBENA L. Vervain. 



Annual or perennial herbs, erect or prostrate, with simple or pinnately lobed leaves 

 and terminal bracted spikes of flowers; calyx 5-toothed, sometimes unequally so; 

 corolla usually bluish or purple, with 5 unequal lobes; stamens 4, didynamous, the 

 connective sometimes with a gland; ovary 4-celled, the stigma 2-lobed; fruit of 4 

 nutlets separating at maturity, without a stylopodium. 



key to the species. 



Anthers of the upper stamens glandular-appendaged; flowers 

 in depressed spikes; corollas conspicuous. 

 Calyx lobes shortly setaceous-tipped, nearly equal; bracts 

 merely acute; plants erect; nutlets nearly smooth on 



the lower fourth ; flowers rose purple 1. V. wrightii. 



Calyx lobes with long setaceous tips, conspicuously unequal; 

 bracts acute or long-acuminate; plants prostrate; nut- 

 lets reticulate almost to the base; flowers rose or bluish 

 purple. 

 Segments of the leaves oblong-lanceolate, 3 to 4 mm. 

 wide; flowers bluish purple; plants stout, occa- 

 sionally with some suberect stems 2. V. ambrosiaefolia. 



Segments of the leaves narrowly oblong-linear, 1 to 2 

 mm. wide; flowers rose purple; plants lower and 



with slender stems 3. V. puhera. 



Anthers not glandular-appendaged; flowers in elongated spikes; 

 corollas usually small; leaves simple or once pinnate. 

 Bracts longer than the fruiting calyx; stems prostrate or 

 erect. 

 Plants prostrate, only the ends of the stems ascending. 4. V. bracteosa. 



Plants erect, all the stems rigidly upright 5. V. imbricata. 



Bracts shorter than the fruiting calyx; stems erect. 

 Leaves not lobed; spikes dense. 



Fruiting calyx almost glabrous; plants sparingly 



hispid 6. V. hastata. 



Fruiting calyx appressed-hirsutulous; plants hispid- 



villous throughout 7. V. macdougalii. 



\ 



