BUXACEAE 201 



1. Callitriche Austinii Engelm. Terrestrial Water-starwort. 

 (Man. p. 596 ; I. F.y. 2jjg.) In damp, shaded places, N. Y. and N. J. to 

 Mo. and Tex. — Pennsylvania : Bucks ; Monroe, Tobyhanna Mills. 



2. Callitriche palustris L. Vernal WaTER-STarworT. (Man. p. 

 597 ; I. F. f. 2^40.) Mostly in cold or running water, apparently occur- 

 ring nearly throughout the U. S. and Can. Also in vS. Am., Eu. and Asia. 

 —Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; 

 Lancaster ; Philadelphia ; Lack.awanna ; Tioga ; Blair ; Hunt- 

 ingdon. 



3. Callitriche heterophylla Pursh. Larger Water-starwort. 

 (Man. p. 597; I. F. y. 2341.) In ponds and slow streams, N. Eng. to 

 Fla., N. W. Terr., Colo, and La. — Pcnnsylvajiia : Pike; Monroe; 

 Northampton ; Bucks. 



4. Callitriche bifida (L. ) Morong. Autumnal Water-starwort. 

 (Man. p. 597 ; I. F.y. 2J42.) In flowing water, Quebec to Man., Pa. and 

 Ore., south in the Rocky Mts. to Colo. Also in Eu. and Asia. — Pennsyl- 

 vania : Bucks, Sellersville. 



Order 16. SAPINDALES. 



Flowers regular, or nearly so, except in Hippocastanaceae, which are shrubs 

 or trees with digitately compound leaves. 

 Corolla wanting. Fam. i. Buxaceae. 



Corolla present. 

 Herbs with tender tissues. Fam. 2. Limnanthaceae. 



Shrubs or trees, or rarelj' herbaceous vines. 

 Ovary i-celled (in our representatives) : fruit a drupe. 



Fam. 3. Anacardiaceae. 

 Ovary 2-several-celled : fruit various. 



Leaves simple : blades pinnately veined. 

 Seed without an aril : fruit drupaceous. 



Fam. 4. Ilicaceae. 

 Seed with an aril : fruit capsular. Fam. 5. Cel.astraceae. 

 Leaves simple, the blades palmately veined, or compound. 

 Leaves opposite. 

 Fruit a 2-winged samara. Fam. 6. Aceraceae. 



Fruit a capsule. 



Flowers regular : fruit a bladdery 3-lobed capsule. 



Fam. 7. Staphyleaceae. 

 Flowers irregular : fruit a leathery globular capsule. 



Fam. 8. Hippocastanaceae. 

 Leaves alternate. Fam. 9. Sapindaceae. 



Flowers very irregular ; the posterior sepal a large sac. 



Fam. 10. Balsaminaceae. 



Family i. BUXACEAE Dumort. Box Family. 

 1. PACHYSANDRA Michx. 

 1. Pachysandra procumbens Michx. AllEGHany Mountain 

 Spurge. (Man. p. 599; I. F. /. 2j4j.) In woods, W. Va. to Fla. and 

 La. Adv. northward. — Pennsylvania : Delaware, escaped. 



