118. Laiuatae 213 



1 . Verbena L. — Vervain 

 1. Flowers 1.5-2.5 cm long; bracts shorter than the calyx; leaves 

 incisely lobed or toothed : open woods, occasional. May-Aug. 



V. canadensis (L.) Britt. 



1. Flowers 4-10 mm long. 



2. Bracts longer than the flowers; stems decumbent, hirsute; road- 

 sides and waste places. June-Sept. [V. bracieosa Michx.] 



V. bracteata Lag. & Rodr. 



2. Bracts shorter than the flowers; stem erect; spikes slender or 



filiform. 



3. Corolla white; spikes filifoiTn; calyx in fruit 2 mm or less in 



length; leaves serrate; roadsides and open woods, common. 



July-Sept. Hybridizes with V. bracteata and V. stricta. 



White Vervain V. urticifolia L. 



3. Corolla lavender-purple to blue (rarely pink) ; spikes slender; 

 fruiting calyx more than 2 mm long. 

 4. Plants soft-pubescent; leaves oval, serrate; calyx 4-5 mm 

 long; nutlets ellipsoid, 2.5 mm long; roadsides and 



fields, common. June-Sept. Hoary Vervain 



V. stricta Vent. 



4. Plants glabrous, or sparsely rough-pubescent. 



5. Leaves lanceolate, acuminate, the petioles 1-2 cm long; 

 calyx 2-3 mm long; nutlets smooth, 1.5-2 mm long; 

 roadsides and open woods, common. July-Sept. Blue 



Vervain V. hastata L. 



5. Leaves linear to oblanceolate, obtuse, sessile or nearly 

 so; calyx 3-4 mm long; nutlets reticulate, 3 mm long; 

 roadsides and fields. June-Aug. Narrow-leaved Ver- 

 vain [V. arigustifolia Michx.]. Hybridizes with V. 



stricta, T^. hastata, and V. bracteata 



V. simplex Lehm. 



2. Phyla Lour. — Frog-fruit 



{Lippia [Houst.] L.) 



P. lanceolata (Michx.) Greene. River banks, shores, along ditches, 

 and in wet meadow.s, common. June-Sept. [L. lanceolata var. recognita 

 Fern. & Grisc.]. 



117. Phrymaceae Schauer — Lopseed Family 

 1. Phryma L. — Lopseed 



P. leptostachya L. Alluvial soil in woods, common throughout 111. 

 June-Aug. 



118. Labiatae Juss. — Mint Family 

 (Lamiaceae Lindl. ; Menthaceae L.F.Ward ex Safford) 

 1. Corolla nearly regular, almost equally 5- (or 4-) lobed. 



2. Leaves entire or essentially so; plants glandular-puberulent. 



3. Stamens included or only slightly exserted; calyx nearly equally 5- 

 toothed 3. Isanthus 



