VERVAIN FAMILY 741 



keeled. Corolla 2-lipped; tube curved; limb 4-lobed, oblique. Stamens 4, 

 didymous; connective of the anthers not appendaged. Ovary 2-celled; stigma 

 oblique; ovules solitary in each cell. Fruit tardily separating into two nutlets. 

 [Lippia in part.] 



Leaves from linear-oblanceolate to cuneate, 2-8-toothed above; peduncles slightly if any 



exceeding the leaves. 1. P. cuneifolia. 



Leaves lanceolate, oblong, or oval, sharply serrate; peduncles much exceeding the leaves. 



2. P. lanceolata. 



1. P. cuneifolia (Torr.) Greene. Stems branched at the base, procumbent 

 or creeping, 2-10 dm. long; leaves opposite and more or less fascicled in the 

 axils; blades 1-3 cm. long; midvein prominent, the lateral ones obsolete; corolla 

 purplish or whitish, 4 mm. long. Lippia cuneifolia (Torr.) Steud. Plains and 

 prairies: S.D. Tex. Ariz. Wyo. Plain Submont. Je-Au. 



2. P. lanceolata (Michx.) Greene. Stem branched from the base, pro- 

 cumbent, 1-4 dm. long; leaves opposite, rarely fasciculate; blades elliptic-lance- 

 olate, 1.5-5 cm. long, a.cute, with about 4 pairs of lateral veins; corolla pale blue, 

 2-2.5 mm. long. Valleys: Ont. Fla. Tex. Neb. Plain Son. Je-O. 



FAMILY 115. LAMIACEAE. MINT FAMILY. 



Aromatic herbs or shrubs, with 4-angled stems. Leaves opposite or 

 whorled, simple, usually toothed or lobed, glandular-punctate. Flowers 

 perfect, irregular, zygomorphic, or nearly regular, pseudo-verticillate, i. e., 

 in congested axillary reduced cymes. Calyx of 5 united sepals, sometimes 

 regular, sometimes irregular, and then usually 2-lipped. Corolla bilabiate, 

 or nearly regular. Stamens 4, did3'namous, or one of the pairs abortive; 

 anthers 2-celled. Gynoecium of united carpels; ovary 4-lobed and 4-celled; 

 styles united, arising between the lobes; stigma terminal; ovules solitary in 

 each cell. Fruit of 4 nutlets, included in the persistent calyx. Endosperm 

 fleshy or wanting. 



Ovary of 4 united nutlets; style not basal; nutlets laterally attached. 

 Corolla strongly bilateral/the upper lip very small, the lower large. 



Flowers in small congested cymes, axillary to small bracts, and forming a raceme- 

 like panicle; calyx-lobes shorter than the tube; leaves toothed. 



l. TEUCRFUM. 

 Flowers solitary in the axils of bracts similar to the leaves ; calyx-lobes longer 



than the tube; leaves laciniate. 2. MELOSMON. 



Corolla almost regularly 5-lobed, but lobes declined; stamens long-exserted and 



coiled. 3. TRICHOSTEMA. 



Ovary of 4 distinct or nearly distinct nutlets; styles basal; nutlets basally attached. 

 Corolla bilabiate. 



Calyx 2-lipped; both lips entire; stamens 4. 



Calyx not inflated, the upper lip with a crest on the upper side. 



4. SCUTELLARIA. 



Calyx inflated, without a crest. 5. SALAZARIA 



Calyx either 2-lipped and at least one of the lips toothed, or regularly 4-5-toothed. 

 Stamens included in the corolla-tube. 6. MARRUBIUM. 



Stamens exserted from the tube. 

 Upper lip of the corolla concave. 

 Anther-bearing stamens 4. 



Upper stamens longer than the lower. 

 Calyx 5-toothed. 



Anther-sacs parallel or nearly so; stamens divergent. 



7. AGASTACHE. 

 Anther-sacs divaricate; anther approximate in pairs. 



Flowers in terminal spikes; floral leaves reduced; plant 



erect. 8. NEPETA. 



Flowers in axillary verticils; floral leaves like the rest; 



plant spreading. 9. GLECOMA. 



Calyx distinctly 2-lipped. 10. MOLDAVICA. 



Upper stamens shorter than the lower. 



Calyx distinctly 2-lipped, closed in fruit. 11. PRUNELLA. 

 Calyx 5-toothed, not 2-lipped, open in fruit. 



Calvx membranous, inflated in fruit, faintly nerved. 



12. PRACOCEPHALUM. 



Calyx not membranous, not inflated hi fruit, strongly 5-10- 

 nerved. 



