368 SYSTEMATIC BOTANY 



separate the seed from its enclosing part of the 

 ovary. So that these four seeds are not seeds but 

 parts of a schizocarp, they are usually called nutlets 

 and of course they answer the function of seeds in 

 every way (p. 241). 



LEUCAS ASPERA, Spr., or on the hills take L. HELI- 

 ANTHEMIFOLIA, Desf. The former plant is often used 

 as a pot herb and is cultivated for that purpose in 

 some districts. Stem much branched, four-angled, 

 rough or scabrid with short stout hairs. Leaves 

 opposite, decussate, linear or oblong, narrowed to 

 the short petiole, generally crenate, and with pinnate 

 venation. 



Flowers arranged in dense clusters towards the ends 

 of the branches, with three or four leaves coming out 

 from the base and sometimes two from the top, and 

 a number of linear bracts and bracteoles. The cluster 

 can be divided easily into two parts, attached to oppo- 

 site sides of the stem ; each half again can be divided 

 repeatedly into three parts, showing that it has a cymose 

 arrangement : it is thus a verticillaster formed of two 

 cymose inflorescences, larger and more condensed than 

 in OCIMUM (p. 195). Calyx, tubular, curved, with, in 

 L. ASPERA, L. a very oblique mouth opening forwards 

 and, ten minute teeth at the ends of ten veins or ribs. 

 Corolla white, monopetalous and two-lipped, the upper 

 lip arched and very hairy on the outer surface, the 

 lower large and spreading forwards, with three lobes, 

 of which the middle one is the largest and slightly 

 notched (emarginate). Stamens four standing up under 

 the upper lip in two pairs didynamous, (the middle 

 pair slightly longer than the outer). 



