392 EUPHOKBIACEJE. (s PURGE FAMILY.) 



{ 3. GYNAMBL6SIS, Torr. (Engelmannia, Klotzsch.) Sterile flowers with 

 a 5- (sometimes 3-4-) parted calyx, and as many petals and scale-like glands oppo* 

 site the latter, the stamens varying from 5 to 10 : fertile flowers with a 5-parted 

 calyx, no petals, 5 glands, and a 2-celled ovary, crowned with 2 sessile 2-parted 

 stigmas; the fruit 2-seeded, or often by abortion l-seeded. (This may perhaps 

 rank as a genus.) 



3. C. inoiiaiitliogyiniin, Michx. Kepeatedly 3-2-forked into di- 

 verging branches, stellately pubescent; leaves silvery-woolly beneath, ovate- 

 elliptical or oblong, often a little heart-shaped at the base, entire, on slender 

 petioles ; flowers in the forks, the sterile few on the summit of a short erect pe- 

 duncle, the fertile few and clustered or mostly solitary on short recurved pedun- 

 cles. (C. ellipticum, Nutt. Engelmannia Nuttalliana, Klotzsch. Gynam- 

 blosis monanthogyna, Torr.) Barrens and dry prairies, from Illinois and 

 Kentucky southward and westward. June - Sept. 



7. CROTONOPSIS, Michx. CKOTONOPSIS. 



Mowers monoecious, axillary along the branches, and terminal, the lower fer- 

 tile. Ster. Fl. Calyx 5-parted. Petals and stamens 5 : filaments distinct, 

 enlarged at the apex. Pert. Fl. Calyx 3 - 5-parted. Petals none. Petal-like 

 scales 5, opposite the sepals. Ovary 1-celled, 1-ovuled: stigmas 3, each 2- 

 lobed. Fruit dry and indehiscent, small, l-seeded. A slender low annual, 

 with alternate or opposite short-petioled linear or lanceolate leaves, which are 

 green and smoothish above, but silvery hoary with starry hairs and scurfy with 

 brownish scales underneath, as well as the branches, &c. (Name compounded 

 of Kporcoi/, and tn/rts, appearance, for a plant with the aspect of Croton.) 



1. C. till c:\ris, Michx. Pine barrens of New Jersey (Knieskem) to Vir- 

 ginia, Kentucky, and southward. July - Sept. Flowers sessile, small. 



8. PHYL.I.ANTHUS, L. PHYLLANTHUS. 



Flowers monoecious, axillary. Calyx 5 - 6-parted. Petals none. Ster. Fl. 

 Stamens 3 : filaments united in a column, surrounded by 5 - 6 glands or a 5 - 6- 

 lobed glandular disk. Fert. Fl. Ovary 3-celled ; the cells 2-ovuled : styles 3, 

 each 2-cleft : stigmas 6. Pod depressed, separating into 3 carpels, which split 

 into 2 valves. Leaves alternate, with small stipules. (Name composed of 

 <uAXov, leaf, and avdos, blossom, because the flowers in some species [not in 

 ours] are borne upon what appear like leaves.) 



1. P. Carolincnsis, Walt. Annual, low and slender, branched ; leaves 

 2-ranked, obovate or oval, short-petioled; flowers commonly 2 in each axil, 

 almost sessile, one staminate, the other fertile. Gravelly banks ; W. Penn. to 

 Illinois and southward. July -Sept. 



9. PACHYSANDRA, Michx. PACHYSANDRA. 



Flowers monoecious, in naked spikes. Calyx 4-parted. Petals none. Ster. 

 Fl. Stamens 4, separate, surrounding the rudiment of an ovary : filaments 

 long-exserted, thick and flat : anthers oblong-linear. Fert. Fl. Ovary 3-celled : 



