SPUKGE FAMILY. 379 



CrV. EUPHORBIACEJl, SPUKGE FAMILY. 



Plants with mostly milky acrid juice and monoecious or 

 dioecious flowers, of very various striicture ; the ovary and 

 fruit commonly 3-celled and with single or at most a pair of 

 hanging ovules and seeds in each cell. A large family in warm 

 countries, always difficult for the beginner. The peculiar 

 characters of the flowers are more fully specified in the fol- 

 lowing synopsis. 



* Ovules and seeds only one in each cell. 

 +- Flowers, both staminate and pistillate, really destitute both of calyx and corolla ; a 

 pistillate and numerous staminate ones surrounded by a cup-like involucre 

 which imitates a calyx, so that the whole may be taken for one perfect flower. 



1. EUPHOKBIA. These plants may be known, mostly, by having the 3-lobed ovary 



raised out of the cup, on a curved stalk, its 3 short styles each 2-cleft, making 6 

 stigmas. Fruit when ripe bursting into the 3 carpels, and each splitting into 2 valves, 

 discharging the seed. What seems to be a stamen with a jointed filament is really 

 a staminate flower, in the axil of a slender bract, consisting of a single stamen on a 

 pedicel, the joint being the junction. 



+- -I- Flowers of both kinds provided tvith a distinct calyx. 



++ Stamens 5 or more. 



= Flowers in cymose (2-S-forked) panicles; stamens 10 or more. 



2. JATROPHA. Fertile flowers in the main forks of the panicle. Calyx colored like a 



corolla, in the sterile flowers mostly salver-shaped and 5-lobed, enclosing 10-30 sta- 

 mens, somewhat monadelphous in two or more ranks ; in the fertile 5-parted. Styles 

 3, united below, once or twice forked at the apex. Pod 3-celled, 3-seeded. Leaves 

 alternate, long-petioled, with stipules. ^ 



=. ^-. Flowers in terminal racemes or spikes. 



II Leaves scarcely or not at all lobed, often entire. 



o Ovary and fruit \ -celled. 



8. CROTONOPSIS. Flowers montiecious, in very small termin.al or lateral spikes or clus- 

 ters, the lower ones fertile. Sterile flowers with an equally 5-parted calyx, .■> spalu- 

 late petals, and 5 stamens opposite the petals. Fertile flowers with unequally 

 3-5-parted calyx, petiils, but 5 petal-like scales opposite the divisions of the calyx. 



o o Ovary 2^ {commonly 3-) celled, or rarely ^-celled in No. 6. 



4. CllOTON. Flowers monoecious or dia;cious, generally in racemes or spikes. Sterile 



flowers with a normally 5-parted calyx, as many petals T)r rudiments as there are calyx 

 lobes and alternating with lobes of the disk, the stamens 5 or more. Fertile flowers 

 with a .5-10-cleft or parted calyx, the [tetals or very small rudiments. 



5. COlil.FAlM. Flowers mona?cious. Sterile flowers with a membranaceous 3-6-partcd 



calyx, the divisions imbricated and becoming reflexed, five short scale-like petals 

 alternating with as many glands, and many or numerous stamens. Fertile flowers 

 with a 5-cleft calyx but no petals, the ovary surrounded by 5 scales. 



6. ACALYPHA. Flowers in .small clusters disposed in spikes, stiiminate above, fertile at 



base ; or sometimes the two sorts in separate spikes. Calyx of sterile flowers, 4- 

 parted, of fertile 8-5-i)arted. Stamens 8-lC, short, monadeljdious at base ; the 2 cells 

 of the anther long and hanging. Styles 3, cut-fringed on the upper face, red. Pod 

 of 3 (rarely 2 or 1) lobes or cells. Fertile flower dusters embraced by a leaf-like cut- 

 Inbod bract. Loaves alternate, iietioliMl, with stijiulos, serrate. 



