VERVAIN FAMILY. 330 



4. DIANTHERA. ((Jivok for double anther, alluding to the two 

 S'.'paratcd cells on each lilament.) Flowers all summer. % 



D. hiimilis, Engelm. & Gray. Muddy banks of streams S. Car., S. ; 

 4'-8' hiuh, smooth", with lauce-ovate, sliort-petioled leaves longer than 

 llu' 8-4-tlowered peduncles in their axils, and small pale purple flowers. 



D. Americana, Linn. Wet borders of streauis ; 2° high, smooth, with 

 long linear-lanceolate leaves, and long peduncles (4'-G' long) bearing an 

 oblong spike of pale purple flowers. 



5. DICLIPTERA. (Greek words for double, ving, from the 2-valved 



pod.) 



D. brachiata, Spreng. Low banks, N. Car., S. ; is nearly sniootli, 

 with (i-angled stem bearing many branches, thin ovate-oblong pointed 

 leaves on slender petiole and interrupted spike-like clusters of small 

 purple flowers, each with a pair of conspicuous flat bracts. 11 



LXXXVIII. VERBENACE^, VERVAIN FAMILY. 



Plants Avith opposite (or sometimes whorled) leaves, cliff er- 

 iug from the other orders with irregular moiiopetalous and 

 didynamous or tetrandrous flowers by the ovary not 4-lobed 

 and with a single ovule in each of its (1-4) cells, the fruit 

 either fleshy or when dry at length splitting into as many 

 1-celled indehiscent nutlets. Plants seldom aromatic. 



* Ovary 1-celled and 1-ovuled. 



1. PHUYMA. Flower.s in slciuler loose spikes. Calyx cylindrical, '2-lii)ped, the upper liii 



of 3 slender-pointed teeth, the lower short and 2-toothed. Corolla tubular, 2-lipped, 

 the upper lip notched, lower larger and 3-lobed. Stamens included. Ovary foriiiing 

 a simple akene in the calyx. Herbs. 



» « Ovary 2- or more-celled, toith few to several ovules. 

 -I- Flowers in heads, spikes, or racemes, the flowers expanding from below upwards. 



2. LANTANA. Flowers in heads or short spikes. Calyx minute, obscurely 4-tootlu'd. 



Corolla with an unequal 4-cleft spreading border, the upper lobe sometimes notched. 

 Stamens included. Ovary 2-celled, becoming berry-hke, and containing 2 little stones 

 or nutlets. Shrubs or herbs. 



3. LIPPIA. Flowers in heads, spikes, or racemes. Calyx tubular, 2-.')-tonthod. Corolla 



tubular, with 5-lobed 2-lipped border, the lower .S-lobed lip larger. Stamens included. 

 Ovary and dry fruit 2-celled, 2-seedcd. 



4. VERBKNA. Flowers in spikes or heads. Calyx tubular or prismatic, r)-ribbed and 



plaited. Corolla salver-form, the tube often curved, the border rather unequally 5- 

 cleft. Stamens included ; upi)pr i>air sometimes wanting the anthers. Ovary 4-celled, 

 at maturity splitting into 4 dry akenes or nutlets. Herbs. 



+- +■ Floioers cymose, expanding from above {or center) dotcmcards. 

 ^^ Flowers nearly regular, in cymes from the axils of the simple leaves ; shrvbs. 



5. CALLM'AKPA. Calyx 4-.'>-toothea, short. Corolla tubular-bell-shaped, short, 4-5- 



lobed. Stamens 4, protruded, nearly equal. Ovary 4-celled, in fruit berry-like, with 

 4 little stones. ^^ ^^ Flowers irregular. 



■ 6. VITKX. Calyx 5-toothed. Corolla tubular (tube short), with a spreading 2-Iipped 

 border, the lower lip 3-parted and rather larger than the 2-lobed U]>per lip. Stamens 

 4. protruded, as is the style. Ovary 4-celled, becoming berry-like in the fruit, which 



