26 KEY TO THE GENERA OF MANHATTAN PLANTS. 



Okdek 80. PHRYMEAE. 



201. Phvyma. Fruits in a long, loose, slender spike, almost sessile, 

 reflexed and closely appressed to axis, enclosed in the calyx. Calyx teeth 

 5, the 3 upper, now outer, coriaceous and extending into spine-like pro- 

 jections, 2 lower triangular. Adapted for catching hairs in the 2 "boot 

 jack" sinuses of the upper calyx teeth. Fruit 1-celled, 1-seeded, with 

 thin pericarp. Herbs. 



Okdek 81. LABIATAE. 



Fruit 4-lobed, separating into 4, 1-seeded nutlets. Herbs with op- 

 posite leaves. 



KEY TO OUR GENERA. 



1 . Nutlets rugose-reticulated 2 



1. Not reticulated 3 



2. In a terminal spike, leaves serrate Teucrium. 202 



2. Axillary; leaves narrow, nearly entire Isantkus. 203 



3. Fruit in terminal heads, supported by leaf-like bracts 4 



3. In closely approximate clusters forming a terminal spike 5 



3. Solitary or clustered in the axils 9 



4. Calyx hairy in throat, leaves ovate to lanceolate Monarda. 204 



4. Calyx naked in throat, leaves linear lanceolate Koellia. 205 



5. Calyx strongly 2-lipped 



5 Calyx about equally 5-toothed 7 



6. Lobes entire, spike elongated Salvia! 200 



6. Upper lip 3-toothed, lower 2-toothed, spike oblong, 



with conspicuous, reniform ciliate bracts Prunella. 207 



7. Spike dense, calyx teeth obtuse Vleckia. 208 



7. Spike more or less interrupted, calyx teeth acuminate 8 



8. Stem glabrous, leaves sessile Physostegia. 209 



8. Stem smooth except angles, leaves petioled Stacliys. 210 



8. Stem downy, calyx-teeth spinose. Nepeta. 211 



9. Calyx strongly 2-lipped, closed; upper lip helmnt- 



shaped , Scutellaria . 212 



9. Calyx about equally toothel, sometimes oblique 10 



10. Clusters loose, few flowered, leaves reniform Glechoma. 213 



10. Clusters dense 11 



11. Calyx gibbous at base, 3 upper teeth recurved Hedcnma 214 



11. Calyx not gibbous 12 



12. Teeth strongly spinescent 13 



12. Teeth not spinescent 14 



13. Teeth 5, calyx smooth Leonurus. 215 



13. Teeth 10, calyx woolly Alarrubiiim. 216 



14. Plant downy, odor of mint strong Mentha. 217 



14. Smooth; not strongly aromatic Lycopus. 218 



