KEY TO THE FAMILIES AND GENERA 



115 



prostanthera 



(Tribe. 

 Ajuga Tribe. 



EE. Corolla-tube strongly dilated above. .10. (imeUna. 

 DD. Drupe 4-parted, witli 4 stones, or by 

 reduction 1-stoned (this l-ccUed). 



E. Fertile stamens 2 11. Oxera. 



EE. Fertile stamens 4 12. Cleroden- 



BB. Fr. dry, subcapsular: exocarp with 4 valves [rfron. 



involute at the margin from the base up, 

 which carry off the nutlets and leave no 

 central column 13. Caryopteris. 



Other genera in cultivation in North America are Avicennia, 

 Citharexylum, Congea, Diostea, Faradaya, Premna. 



143. LABIATE. 

 /. Summary of Tribes. 



Ignoring exceptions. 



A. The nutlets fleshy or drupe-hke, af- 

 fixed to a small basal or oblong in- 

 trorsely oblique areole; ovary 4-lobed. 1. Frasia Tribe. 

 AA. The nutlt'ts dry or hard. 



B. Ovary shortly, rarely deeply 4-lobed: 

 nutlets wrinkled or netted, affixed 

 to an obliquely introrse or lateral, 

 usually large, areole. 

 c. Seeds, when known, with endo- 

 sperm : corolla with an ample 



throat and broad lobes 2, 



cc. Seeds without endosperm: corolla 



various 3, 



BB. Ovary 4-parted to the base: nutlets 

 affixed to a small basal or slightly 

 oblique areole. 

 c. Stamens declinate; perfect ones 4, 

 rarely 2; anthers 1-celted by con- 

 fluence 4. OciMUM Tribe. 



D. Subtribe 1. Edocime.e. Areole 

 basal; stamens usually exser- 

 ted ; anterior corolla-lobe 

 usually unlike the others. 

 DD. Subtribe 2. Lav.^ndule.e. Are- 

 ole extrorsely oblique ; sta- 

 mens included ; corolla-lobes 

 equal or the anterior lobe 

 with the lateral ones forming 

 the anterior Up. 

 cc. Stamens ascending, or in the 

 Stachys Tribe sometimes inclu- 

 ded. (Consult also ccc.) 

 D. Perfect stamens 2; anther-cells 

 linear, separate, solitary or 



confluent 5. Monarda Tribe. 



DD. Perfect stamens 4. rarely 2 in 

 the Xepeta Tribe. 

 E. Calyx usually 15-nerved; pos- 

 terior stamens longer than 



the anterior 6. Nepeta Tribe. 



EE. Calyx 5- or 10-nerved; pos- 

 terior stamens shorter than 

 anterior; posterior lip of 

 corolla erect, usually con- 

 cave or fornicate, anterior 



spreading, 3-cut 7. Stachts Tribe. 



F. Subtribe 1. Scutellarie^, 

 Calyx bilabiate or at 

 length 2-part ed , the mouth 

 closed after anthesis. 

 FP. Calyx not bilabiate. 



G. Subtribe 2. Melit- 

 TE^. Corolla-tube 

 long -exserted; calyx 

 broad, of 5 short teeth 

 or 3-4 broad lobes. 

 OG. Corolla-tube included or 

 slightly exserted, rarely 

 long -exserted; calyx 

 tubular or bell-shaped, 

 5-10-toothed. 

 H. Subtribe 3. Mar- 

 RUBIE.E. Stamens 

 included. 

 HB. Subtribe 4. Lamie.e. 

 Stamens exserted. 

 CCC. Stamens straight, diverging or 

 ascending; perfect ones 4 or 2; 

 calyx 0-, 10-, or 13-nerved, rarely 

 15-nerved; corolla-lobes usually 



flat 



D. Subtribe 1. Pogostemone^. 

 Anthers 1-celled, aubglobose; 

 stamens distinct, straight. 

 DD. Anthers 2-celled, at least the 

 younger ones. 

 E. Subtribe 2. Menthoide^. 

 Calyx usually 5- or 10- 

 nerved; stamens distant 

 or divaricate. 



8. Satureia Tribe, 



EE. Subtribe 3. Meli8SE.c:. Calyx 

 usually 13-nerved; stamens 

 ascending, at least at the 

 base. 



//. Key to the Tribes. 



1. Prasia Tribe. 



Not in cultivation. 



2. Prostanthera Tribe. 



a. Calyx bilabiate; lips entire or anterior emar- 



ginate 1. Prostan- 



[Ihcra, 

 AA. Calyx equal, 5-toothed 2. Wesiringia. 



3. Ajuga Tribe. 



A. Corolla-tube slender, lobes 5, subequal, 



spreading 3. Trichostema. 



AA. Corolla-tube, qua-si 1-lipped, the posterior 

 lobes and small lateral ones declinate at the 

 contracted base of the very large anterior 



lobe, or rarely erect 4. Teucrium. 



AAA. Corolta-tube short or exserted, the posterior 

 lip short, erect, 2-cut, anterior much longer 

 and its middle lobe largest 5. Ajuga. 



4. Ocimuzn Tribe. 



A. Subtribe 1. Euocime.e. 

 b. Anterior lobe of corolla hardly longer than 

 the others, often narrower, declinate, flat 

 or slightly concave. 



c. Fruiting calyx deflexed 6. Ocimum. 



cc. Fruiting calyx scarcely enlarging, often 



declinate 7. Moschos^ma. 



BE. Anterior lobe of corolla longer than others, 

 concave or boat-shaped, 

 c. Filaments connate at the base in a tube. . . 8. Coleus. 



cc. Filaments free 9. Plectran- 



\thus. 

 AA. Subtribe 2. L.^vandule^. Sole genus 10. Lavandula. 



5. Monarda Tribe. 



A. Calyx tubular. 11. Monarda. 



AA. Calyx bilabiate. 



b. Fertile anther-cells 2: upper hp of corolla 



4-lobed 12. Perowskia. 



bb. Fertile anther-cells 1 : upper lip of corolla 

 entire or bifid. 

 c. Connective continuous with filament and 

 not indicated unless by a slender 



reflexed tooth 13. RosmaTinits, 



cc. Connective articulated to the filament 

 but not produced or very shortly acumi- 

 nate 14. Audibertia. 



ccc. Connective elongated, versatile on the 

 short filament, its sterile end continued 

 beyond the articulation and either dila- 

 ted or bearing an abortive rudiment 

 of the second anther-cell 15. Salvia. 



6. Nepeta Tribe. 



A. Calyx bilabiate or with the posterior tooth 



much wider than the others 16. Dracoceph- 



aa. Calyx tubular, mouth straight or oblique. \alum. 



B. Stamens erect or divergent; anther-cells 



parallel or at length divergent 17. Lopfianlhua. 



be. Stamens ascending or straightish; anther- 

 cells parallel 18. Cedronella. 



BBB. Stamens ascending and parallel or in a few 

 species rather lax and distant; anther- 

 cells divergent or divaricate 19. Nepeta. 



7. Stachys Tribe. 



Subtribe 1. Scutellaries. 



' A. The calyx-lip entire ^. . .20. Scutellaria. 



AA. The posterior calyx-lip 3-toothed, anterior 



2-fid. 21, Brunella. 



Subtribe 2. Melitteas. 



A. Anther-cells parallel ; calyx subequally 5- 



toothed 22. Pfij/Hostegia. 



AA. Anther-cells divergent; calyx 3-lobed 23. Melittis. 



Subtribe 3. Marrubies. 



Calyx 5~10-toothed; corolla-lube included; 



anther-cells at length confluent 24. Marrubium. 



