214 FLORA OF PHILADELPHIA. 



Fruit oval, flat on the face, longer than the styles. 



2. C. palustris. 

 Fruit obovate, plano-convex, shorter than the styles. 



3. C. heterophylla. 

 Bracts none ; leaves all linear, submerged. 4. C. bifida. 



1. Callitriche Austini Engelm. M. p. 596. Damp, shaded places. Sum- 



mer. 



2. CALLlTPaCHE PALUSTRIS L. M. p. 597. In cold or running water. 



Summer. 



3. Callitriche heterophylla Pursh. M. p. 597. Ponds and slow streams. 



Summer. 

 ^Mcfcs— Rock Hill (Fr.) (Ja.) (Ke.). Berts— Hamburg (Ke.). North- 

 ampton — (P.). 



New Jersey — Common. 



New Cosine— Blackbird Head, Canby. 



4. Callitriche bifida (L.) Morong. M. p. 597. Flowing water. Summer. 



Bucls — Near Sellersville (Fr.). 



Order 16. SAPINDALES- 



Flowers regular or nearly so (except in Hippocastanaceae, which are trees or 

 shrubs with digitately compound leaves). 

 Petals none ; flowers monoecious or dioecious ; leaves evergreen. 

 Stamens mostly 3 ; low heath-like shrubs. 



Fam. 1. Empetraceae. 

 Stamens 4-7 ; herbs with broad leaves and spiked flowers. 



Fam. 2. Buxaceae. 

 Petals present ; leaves deciduous except some Ilicaeeae. 



Low annual herbs, with pinnately-divided leaves, the stamens twice 



as many as the petals. Fam. 3. Limnanthaceae. 



Trees or shrubs, rarely herbaceous vines. 

 Ovary 1-celled; fruit a small drupe. 



Fam. 4. Anacardaceae. 

 Ovary 2-several-celled. 



Leaves simple, pinnately veined. 



Seeds not arilled. Fam. 5. Ilicaeeae. 



Seeds arilled ; ovules erect ; capsule fleshy. 



Fam. 6. Celastraceae. 

 Leaves simple and palmately veined, or compound. 

 Fruit a bladdery 3-lobed capsule. 



Fam. 7. Staphyleaceae. 

 Fruit of 2-winged samaras. 



Fam. 8. Aceraceae. 

 Fruit a leathery capsule ; flowers . irregular ; leaves 

 digitately compound. Fam. 9. Hippocastanaceae. 

 Flowers very irregular, the posterior sepal large, saccate ; succulent herbs, 

 the capsule elastically dehiscent. Fam. 10. Balsaminaceae. 



Family 1. EMPETRACEAE Dumort. Crowberry Family. 

 1. COREMA Don. 

 1. COREMA CoNRADii Torr. Broom Crowberry. M. p. 598. Sandy pine- 

 barrens. Early spring. 

 Burlington — * ' The Plains. ' ' 



