XCVIII, LABTATvE. 4G3 



17. LEONURUS, Linn. 



Erect leafy stout herbs. Leaves lobed. Flowers small, in dense- 

 flowered axillary distant whorls. Calyx 5-nerved, turbinate ; teeth 5, 

 spreading, spiuescent. Corolla 2-lipped ; tube naked or annulate 

 within ; upper lip entire, erect ; lower lip 3-fid, the middle lobe 

 obcordate. Stamens 4, didynamous, the lower pair the longest ; 

 filaments ascending ; anthers conniving, the cells transverse. Disk 

 uniform. Ovary 4-partite ; style 2-fid, the lobes equal, obtuse or 

 subulate. Fruit of 4 triquetrous smooth dry nutlets with truncate 

 apices ; basal scar small. — Distrib. Europe, Asia, Africa, America ; 

 species 10. 



1. Leonurus sibiricus, Limi. Sj). PL (1753) p. 584. Annual, 

 2-6 ft. high ; stems obtusely quadrangular, furrowed, usually softly 

 pubescent. Leaves l|-4 in. long, palmatipartite with linear incised 

 segments, glabrous or nearly so above, pale and more or less pubescent 

 on the veins beneath ; nerves strong below ; petioles reaching 2 in. 

 long. Elowers in axillary whorls ; upper floral leaves usually entire ; 

 bracts ^ in. long, spinescent. Calyx ^-j in. long, glabrous or slightly 

 pubescent, 5-nerved; tube ^ in. long; teeth spinescent from a trian- 

 gular base. Corolla red, reaching ^ in. long ; tube about equalling the 

 limb, annulate within ; upper lip obovate, galeate, entire, pubescent ; 

 lower lip about equalling the upper, 3-lobed, the middle lobe obcordate, 

 the 2 lateral lobes smaller, rounded. Nutlets yL in. long, triquetrous, 

 truncate. El. B. I. v. 4, p. 678 ; Woodr. in Journ. Bomb. Nat. v. 12 

 (1899) p. 362 ; Prain, Beng. PI. p. 854 ; Watt, Diet. Econ. Prod. v. 4, 

 p. 625. Leonurus tataricus, Eoxb. El. Ind. v. 3, p. 8 ; Grab. Cat. 

 p. 152 ; Dak. & Gibs. Suppl. p. 67. — Flowers : Sept. 



Doubtfully indigenous. Konkan : Bombay, Woodrow ; Santayeri, Woodrow. 

 S. M. Country: Belgaum (introduced), Stocks, 5.57!; gardens in Belgaum where 

 it is naturalized, Law ex Graham. — Distrib. India (Bengal, Silhet, W. Peninsula); 

 Tropical Asia, Africa, and America. 



18. LEUCAS, E. Br. 



Herbs or undershrubs usually woolly or villous. Flowers usually 

 white, in axillary generally distant whorls. Calyx lO-nerved, striate ; 

 mouth equal or oblique, equally or unequally 6-10-toothed. Corolla 

 2-lipped ; tube included, annulate or naked within ; upper lip erect, 

 concave, externally villous ; lower lip spreading, 3-fid, the midlobe 

 large. Stamens 4, didynamous, the lower pair the longest ; filaments 

 ascending ; anthers conniving, the cells divaricate, at length confluent. 

 Disk entire or lobed, equal or glandular in front. Ovary 4-partite ; 

 style subulate at the apex, the upper lobe obsolete. Fruit of 4 ovoid 

 triquetrous obtuse dry nutlets ; basal scar small. — Distrib. Species 

 about 100, chiefly Asiatic and African. 



Calyx-mouth oblique. 



Mouth of calyx much produced below 1 . L^ urticifoUa. 



Mouth of calyx produced above. 

 Calyx-teeth very short. 



Calyx-mouth not villous within. 



Calyx smooth below, ribbed and hispid above 2. L. asjiera. 



Calyx smooth throughout or nearly so ; calyx- 

 mouth very oblique 3. L.linifolia. 



