262 Key to the System of 



often entire; racemes spike-like ; calyx-lobes longer than 

 broad ; stigmas conspicuously beset with short hairlets ; 

 fruit rather small, roundish-quadrangular, almost smooth 

 or slightly rough, broadest at the base. 



H. heterophylla. 



Leaves lobeless 1202 



1202. Leaves semicylindric-linear, carnulent, entire. 



Glabrous ; leaves scattered, pointed ; flowers forming leafy 

 racemes, usually clustered within each floral leaf ; stigmas 

 almost glabrous, as well as the fruit-cells from two to 

 four; fruit ovate -globular or somewhat quadrangular, 

 slightly wrinkled or smooth. H. digyiia. 



Leaves flat or recurved at the margin, generally 

 denticulated ... ... 1203 



1203. Leaves narrow, recurved along the margin. 



Beset with spreading soft hairlets ; leaves mostly scattered, 

 usually rather long, broad- or lanceolate-linear, entire or 

 somewhat denticulated ; stigmas beset with minute hair- 

 lets ; fruit tubercular-rough, longer than broad. 



H. elata. 



Leaves broadish, flat 1204 



1204. Almost or quite erect 1205 



Prostrate and somewhat ascending ... ... ... 1207 



1205. Fruit rather large. 



Almost smooth or somewhat rough, rather rigid, slightly 

 beset with hairlets ; leaves from broad- to narrow - 

 lanceolar, often of greyish hue, hardly paler beneath, 

 the lower opposite, the upper scattered, distinctly or 

 imperfectly serrated or denticulated or nearly entire ; 

 flowers one or more in the axil of each floral leaf or 

 bract ; lobes of the calyx considerably longer than 

 broad ; stigmas beset with minute hairlets ; fruit rather 

 large, nearly globular or somewhat quadrangular, often 

 tubercular-rough. H- aspera. 



Fruit very small 1206 



1206. Leaves from ovate- to narrow-lanceolar. 



Beset with rather rigid hairlets ; leaves mostly opposite, 

 rather short, serrulated ; bracts scattered; flowers soli- 

 tary within each bract; fruit pale, globular-quadrangular, 

 wrinkled and rough, not seldom one-seeded. 



H. tetragyna. 



