Labiatae 767 



13B. Nutlets cuneate or obovatc-cuneate at the base, truncate or obliquely truncate at apex, acutely 3-angIecl. 



15A. Anther-locules parallel; upper lip of corolla suberect, densely villous on back; anthers glabrous H. Leonunis 



15B. Anther-locules divergent; upper lip of corolla arcuately incurved, galeate, glabrous or soft-pubescent on back; anthers 



barbate or glabrous 15. Lamiiim 



5B. Upper lip of corolla not concave on back. 

 16A. Fertile stamens 2. 



17A. Anthers of fertile stamens 1-locular or apparently 2-locular; connective elongate at base and jointed with the filament; 



corolla clearly bilabiate 16- Salvia 



17B. Anthers of fertile stamens 2-locular, the locules approximate or confluent at tip; connective not elongate at base; corolla 

 nearly actinomorphic. 



18A. Nutlets subglobosc, without angles or ridges, rounded at apex 17. Mosla 



18B. Nutlets broadly cuneate, triangular, obliquely truncate and obsoletely undulate-toothed at apex 18. Lycopus 



16B. Fertile stamens 4. 



19A. Stamens erect, spreading, or ascending under the upper lip of corolla; corolla actinomorphic or bilabiate, the upper lip 2- 

 lobed, the lower lip 3-lobed. 

 20A. Stamens, at least the lower pair, ascending or arcuate beneath the upper lip of corolla, not exsertcd; anthers approximate; 



nutlets globose 19. Clinopodium 



20B. Stamens erect or spreading, not ascending beneath the upper lip. 

 21 A. Calyx bilabiate; nutlets globose, obtuse. 



22A. Small shrubs with small leaves; corolla distinctly bilabiate; nutlets rounded, rather flattened, smooth. . . 20. Thymus 

 22B. Herbs; corolla indistinctly bilabiate. 



23A. Annuals; spikes densely many-flowered; nutlets reticulate-veined 21. Perilla 



23B. Perennials; spikes loosely flowered; nutlets veinless 22. Perillula 



2 IB. Calyx actinomorphic; nutlets not globose. 

 24A. Inflorescence not one-sided. 



25A. Anther-locules distinct; flowers or some of them in spaced verticils 23. Mentha 



25B. Anther-locules confluent at tip, becoming 1-locular; flowers in dense terminal spikes; stamens long-exserted. 



26A. Corolla bilabiate, the tube longer than the calyx; bracts caducous; filaments glabrous 24. Leucosceptrum 



26B. Corolla nearly actinomorphic, the tube usually shorter than the calyx; bracts persistent; filaments often long- 

 pilose 25. Dysophylla 



24B. Inflorescence a one-sided spike. 



27A. Calyx deeply 5-fid, the lobes lanceolate 26. Keishea 



27B. Calyx 5-toothed, the teeth deltoid 27. Elsholtzia 



19B. Stamens declined along inner side of the lower navicular lip of corolla; corolla bilabiate, the upper lip 4-lobed, the lower lip 

 undivided 28. Plectranthtis 



1. AMETHYSTEA L. Ruri-hakka Zoku 



Erect nearly glabrous annual; leaves 3- to 5-parted and incised, the floral leaves gradually reduced; verticils loosely arranged, 

 rather many-flowered, pedunculate, forming a narrow terminal panicle; flowers small, blue, pcdicelled; calyx globose-campanulate, 

 10-nerved, the teeth 5, equal; corolla-tube shorter than the calyx, without a ring inside, the limb 4-lobed, the anterior lobes 

 slightly larger; fertile stamens 2, placed in front, ascending, exserted betiveen the upper corolla-lobes; andiers 2-locular, the locules 

 spreading, slightly confluent; nutlets obovoid, the areole on ventral side. One species. 



1. Amethystea caerulea L. Ruri-hakka. Stems erect, duced; calyx 2.5-3 mm. long, slighdy accrescent after anthesis, 



branched, 40-80 cm. long; leaves ovate to narrowly so, 3-6 cm. 5-lobed, the lobes linear-lanceolate; corolla slightly longer than 



long, 2-^ cm. wide, 3(-5)-parted, broadly cuneate at base, the the calyx; nutlets rounded at apex, 1.5 mm. long, net-veined, 



median segment lanceolate, incised, acuminate widi an obtuse the areole obovate, covering lower 2/3 of the body on ventral 



tip, the lateral segments smaller, die petioles 1-2 cm. long; side. Sept.-Oct. Honshu, Kyushu. Korea, Manchuria, 



upper leaves smaller and petiolate, the lateral lobes often re- China to Turkey. 



2. AJUGA L. KiRAN-so Zoku 



Mosdy perennials, somerimes stoloniferous; leaves coarsely toothed or incised, rarely entire; verticils 2- to many-flowered, 

 dense, often forming a terminal spike; flowers subsessile; calyx ovate or globose-campanulate, 10- to many-nerved, equally 

 5-toothed or -lobed; corolla tubular, widened at the tip, the limb bilabiate with the upper lip short, entire or sometimes bifid, 

 the midlobe of the lower lip larger, emarginate or bilobed, the lateral lobes smaller; stamens 4; nutlets obovate, with raised 

 rericuladons, the areole on ventral face. About 50 species, in temperate regions and high mountains in the Tropics. 



l.\. Corolla-tube about 2 cm. long; leaves cordate or partially truncate or rounded at base, prominently incised. 



2 A. Stems 30-50 cm. long; stolons absent; leaves acutely incised, 6-10 cm. long 1. A. incisa 



2B. Stems 10-20 cm. long; stolons present; leaves with few obtuse incisions, 2-5 cm. long 2. A. japonica 



IB. Corolla-tube 6-12 mm. long; leaves cuneate to gradually narrowed toward base. 

 3A. Verticils forming a distinct terminal spike. 



4A. Leaves 5-8 cm. long, 3-6 cm. wide; stems 30-40 cm. long 3. A. ciliala var. villosior 



4B. Leaves 2-4(-6) cm. long, 7-25 mm. wide; stems 10-25 cm. long. 



