Victorian Plants. 217 



1019. All the lobes of the calyx nearly equal. 



Alpine ; glabrous ; branchlets very broadly flattened, with 

 conspicuous and distant indentations ; flowers almost 

 sessile ; calyx supported by crowded bracts ; fruit with 

 a stalk-like base. B. bracteosa. 



The two upper lobes of the calyx much broader than 

 the lower , 1020 



1020. Fruit rather narrow, thinly margined, with a long 



stalk-like base. 



Glabrous; branchlets rather broadly flattened, with slight 

 and distant indentations ; stalklets exceeding the bracts ; 

 lower petals almost as long as the upper one ; fruit almost 

 broad-linear. B. riparia. 



Fruit rather broad, thickly margined, with a short 

 stalk-like base. 



Glabrous ; branchlets broadly flattened ; lower petals con- 

 siderably shorter than the upper one ; stalklets exceeding 

 the bracts ; fruit linear-elliptical. B. eusata. 



PZ.AT1TZ.OBZVBZ. 



1021. Leaves scattered. 



Rather dwarf ; leaves from cordate to almost orbicular, 

 pointed ; stalklets concealed by bracts ; fruit with 

 scarcely any stalk-like base. P. alternifolium. 



Leaves opposite ... ... ... ... ... 1022 



1022. Stalklets concealed by bracts. 



Rather dwarf ; leaves from often deltoid to sometimes 

 cordate-ovate, pointed ; fruit less than twice as long as 

 the calyx, with scarcely any stalk-like base. 



P. obtusangulum. 



Stalklets much exceeding the bracts 1023 



1023. Leaves deltoid. 



Rather dwarf ; fruit several times longer than the calyx, 

 with a short stalk-like base. P. trianglllare, 



Leaves from cordate- to ovate-lanceolar. 



Rather tall ; fruit nearly three times as long as the calyx, 

 with a long stalk-like base. P. f ormosum. 



