EUPHOKBIACE^. (SPUKGE FAMILY.) 421 



2. P. abrotanoides, Nutt. Leaves much divided, with hair-like seg- 

 meuts ; flowers 2-3 together, on short pedicels; capsule oblong, 10-ribbed. — 

 Gravelly places iu the Chattahoochee Hivev (Nutta/l.) — Plaut larger than 

 the last. 



Order 119. EUPHORBIACE^. (Spurge Family.) 



Plants commonly with acrid milky juice, and monoecious or dioe- 

 cious often petalif erous flowers. — Calyx 2 - 8-lobed, mostly valvate in 

 the bud, sometimes wanting. Stigmas 2 - several, simple or divided. 

 Fruit of 2 - several (mostly 3)1- 2-seeded carpels united around a 

 central axis, separating at maturity, rarely 1-celled or indehiscent. 

 Seeds suspended, anatropous. Embryo in fleshy albumen. Cotyle- 

 dons flat. 



Synopsis. 



§ 1. Ovules and seeds solitary iu the cells. Flowers moncecious. 

 * Flowers without floral envelopes, enclosed in a common cup-shaped involucre. 



1. EUPHORBIA. Fertile flower solitary In the 4-5-toothed iuvolucre. Sterile flowers 



several, each reduced to a single stamen. 



* * Flowers in bracted spikes or racemes ; the upper ones sterile, the lowest fertile, 

 ■t- Jlowers apetalous. 

 ■H- Stigmas and cells of the capsule 6-7. . 



2. HIPPOMANE. Carpels woody, indehiscent. Spikes terminal. Stamiuate flowers 



clustered. 



■w- ++ Stigmas and cells of the dehiscent capsule 3. 



3. SEBASTIANIA. Fruit dry. Receptacle with a central column. Seed carunculate. 



4. STILLINGIA. Fruit dry. Receptacle 3-horned. Seed carunculate. 



5. EXCCECARIA. Fruit fleshy. Receptacle with a central column. Seed not carunculate. 



6. ACALYPHA. Stigmas many-parted. Flowers spiked. Bracts of the pistQlate flowers 



leafy, toothed. 



7. TRA6IA. Stigmas 3, simple. Flowers racemed. Bracts small, entire. 



8. MERCURIALIS. Stigmas 2. Calyx 3-parted. Capsule '2-cened. 



<- ■>- Stamiuate flowers (except No. 2 in Croton), or the pistillate also furnished with 



petals. 



9. CROTON. Pistillate flowers apetalous, or with minute petals. Stamens 6 or more, 



distinct. 



10. CROTONOPSIS. Pistillate flowers apetalous. Capsule 1-ceUed. Stamens 5, distinct. 



11. ARGTROTHAMNIA. Pistillate and stamiuate flowers 5-petalled. Capsule 3-celled. 



Stamens 10, monadelphous. 



* * * Flowers cymose or panicled. 



12. JATROPA. Flowers cymose. Petals scarlet. 



13. CNIDOSCOLUS. Flowers cymose. Calyx white, corolla-like. Petals none. 



14. RIGINUS. Flowers iu crowded panicles. Calyx herbaceous. 



§ 2. Ovules, and commonly the seeds, 2 in the cells. 

 * Flowers monoecious, apetalous. Ovary 3-celled. Herbs. 



15. PHYLLANTHUS. Flowers axillary. Calyx 5 - 6-parted. Stamens 3, monadelphous. 



16. PACHYSANDRA. Flowers spiked. Calyx 4-parted. Stamens 4, distinct. 



* * Flowers dioecious, apetalous. Ovary 2-celled. Shrubs. 



17. DRYPETES. Flowers in axillary clusters. Fruit drupaceous, l-ceUed, l-seeded. 



