EUPHOKBIACE.E. (SPURGE FAMILY.) 421 



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

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

 Gravelly places in the Chattahoochee River (NuttalL) Plant larger than 

 the last. 



ORDER 119. EUPHORBIACEJE. (SPURGE FAMILY.) 



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

 cious often petaliferous 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 in the cells. Flowers monoecious. 

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



1. EUPHORBIA. Fertile flower solitary in the 4-5-toothed involucre. Sterile flowers 



several, each reduced to a single stamen. 



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



i- Flowers apetalous. 

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



2. HIPPOMANE. Carpels woody, indehisceut. Spikes terminal. Staminate flowers 



clustered. 



H- -H- 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 pistillate flowers 



leafy, toothed. 



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



8. MERCURIALIS. Stigmas 2. Calyx 3-parted. Capsule 2-celled. 



- H- Staminate 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-celled. Stamens 5, distinct. 



11. ARGYROTHAMNIA. Pistillate and staminate flowers 5-petalled. Capsule 3-celled. 



Stamens 10, monadelphous. 



* * * Flowers C3inose or panicled. 



12. JATROPA. Flowers cymose. Petals scarlet. 



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



14. RICINUS. Flowers in 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. 

 1C. PACHYSANDRA. Flowers spiked. Calyx 4-parted. Stamens 4, distinct. 



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

 17. DRYPZTT.S. Flowers ia axillary clusters. Fruit drupaceous, 1-celled, 1-seeded. 



