40 Chenopodiaceae 



Tribe Polygoneae. Herbs, more rarely undershrubs. 

 Only British genus (tepals free, all erect in fruit) : 



Polygonum (including *Fagopyrum). 



c. (Consisting of the one order Centro- 

 spermae.) Corolla usually haplochlamydeous, 

 sepaloid or petaloid. Heterochlamydy, however, 

 is not uncommon. (For d, Heterochlamydeae, see 

 page 45, for b page 37.) 



Order 9. Centrospermae. Mostly herbs, often 

 with peculiar secondary thickening. Leaves often entire, 

 usually exstipulate. 6'^/))///^j' scarious if present. Flowers 

 homo- or heterochlamydeous. Stamens as many as and 

 opposite to perianth segments or 00 -i. Carpels 00 -i, 

 usually united. Ovary mostly superior and i-loc with 

 I -co campylotropous ovules. Placefitatzoji basal or free 

 central. Two integuments present. Embryo curved. 

 Seeds often reniform and with granulate testa. Peri- 

 sperm often present. 



Suborder i. Chenopodineae. Perianth homo- 

 chlamydeous and sepaloid. Tepals not more than 5 

 with stamens opposite them. Ovule solitary. 



Fam. I. Chenopodiaceae. Herbs, rarely shrubs, 

 often with * bladder-hairs ' (' mealiness '). Leaves alter- 

 nate, exstipulate, fleshy, entire or irregularly lobed, 

 sometimes much reduced. Flowers small, homochlamy- 

 deous. Tepals 5, 3, or i, valvate. Stamens as many 

 or fewer opposite the tepals, bent inwards in bud. 

 Carpels (2), rarely (3-5). Ovary i-loc with one basal 

 ovule. Fruit a nutlet or pyxidium enclosed in persistent 

 perianth. 



