XVI KEY TO FAMILIES AND ABNORMAL G£:NERA 



48^ 



49^ 



Leaves radical : flowers in a spike terminating a leafless 



stem : capsule opening across . . . /. 336. plantago. 



Leaves alternate at least the lower ....... 49 



All leaves opposite 50 



' Twining plants : corolla folded inwards and twisted in 



bud ' P- 293. CONVOLVULACE/E. 



Erect rough herb : flowers in a double row, on one side of 



a curled spike p. 292. boraginace^.. 



Upper leaves often in unequal pairs : ovary not divided to 



the top : seeds flat /. 295. sOLANACEiE. 



Submerged or marsh plant : flowers small unisexual . . . 



/, 147. Serpicula. 

 ' Shrub with milky juice : corolla twisted in bud .... 



p. 78. APOCYNACE/E. 



50 <J Climber or tree, no milky juice . . p. 81. loganiace^. 

 I Erect herbs : leaves three to seven-nerved : capsule incom- 

 [ pletely two-celled . ...../. 288. gentianace^. 



J Leaves opposite 52 



^ (Leaves radical : or upper at least alternate . . . . 55 

 r Corolla regular, twisted or valvate in bud, stamens two : 



52^ fruit fleshy /. 274. oleace^. 



[ Corolla-lobes imbricate in bud ........ 53 



f Fruit of four (dry) nutlets : flowers usually in dense 

 I whorls: scented herbs . . . . . /. 321. labiaT/E. 



53^ Fruit fleshy or of two parts: flowers in spikes or open 



I panicles /. 318. verbenace^. 



[ Fruit a capsule with few or many seeds 54 



f Nodes swollen : bracts in spike conspicuous : capsule 

 I oblong : seeds on springy-stalks . p. 310. acanthace^. 

 54^ Capsule long and slender: leaves thick. 



I p. 308. .eschynanthus. 



[ Capsule short 55 



f Small marsh plants with submerged, finely divided leaves, 

 I often bearing bladders : flowers few with sharp spur . . 



p. 306. UTRICULARIA. 



Green plants : capsule globose or oblong : seeds not on 



hard stalks : bracts not conspicuous 56 



White or coloured plants : no real leaves. OROBRANCHACEiE. 

 Ovary and capsule completely divided 



. p. 87. SCROPHULARIACE/E. 



^ ' Capsule one-celled, the seeds on large placentas intruded 

 from the walls /• 91- GESNERACEiE. 



Fetal-less /lowers. 



(The following are a mixed lot, containing families with only 

 one perianth whorl and petal-less genera and species from 



55^ 



