202 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



2. AMPELOPSIS Michx. 



Leaves 2-3-pinnate, the leaflets ovate, toothed, 1 cm. long or more; fruit black. 



1. A. arborea. 



Leaves of two forms (dimorphic), the larger entire and 3-lobed, the smaller 2-5 cm. 



long, deeply 3-5-lobed; fruit bright blue or whitish 2. A. heterophylla. 



1. Ampelopsis arborea (L.) Rusby. Pepper vine.' 

 Moist woods; Terra Cotta. July; fr. Sept. Southeastern U. S., W. Ind., and Mex. 



2. Ampelopsis heterophylla (Thunb.) Sieb. & Zucc. 



Escaped in places. Native of eastern Asia; common in cultivation. 



3. VITIS L. Grape. 



Leaves floccose- woolly or tomentose beneath. 

 Pubescence brown-tomentose, persistent; tendrils commonly opposite each leaf; 

 leaves shallowly or not at all lobed, l"he margin dentate, the teeth short; fruit 



purple or amber-colored, about 15 mm. in diameter 1. V. labrusca. 



Pubescence brownish, at length white, persistent only on the veins beneath; ten- 

 drils not opposite all the leaves; leaves not lobed, or deeply 3 or 5-lobed, the 

 margin more or less coarsely dentate; fruit black, about 10 mm. in diameter. 



2. V. aestivalis. 

 Leaves glabrous or nearly so. 

 Leaves^more or less incisely toothed or lobed, the lobes acuminate; fiuit 10 mm. 

 in diameter or more, bluish black, sweet. Flowers and fruit in loose clusters. 



3. V. vulpina. 

 Leaves coarsely toothed (sometimes lobed), the teeth short; fruit about 6 mm. in 

 diameter. 

 Leaves commonly longer than broad (measured from sinus to apex), 7 cm. wide 



or'more; fruit in loose clusters, black, sour 4. V. cordifolia. 



Leaves broader than long, smaller; fruit in compact clusters, black, with a bloom, 

 sweet 5. V. nipestris. 



l.[Vitis labrusca L. Fox grape. 



Thickets and low woods. May-June; fr. Aug. Eastern U. S. 



2. Vitis""aestivalis Michx. Summer grape. 

 Thickets and along fences. May-June; fr. Aug.-Sept. Eastern N. Amer. 



3. Vitis vulpina L. Frost grape. 

 Thickets. May-June; fr. July-Aug. Eastern N. Armer. (F. ripana Michx.) 



4. Vitis cordifolia Michx. Chicken grape. 

 Woods and along fences. May-June; fr. Oct. Eastern U. S. 



6. Vitis rupestris Scheele. Sand grape. 



Ravines and along river banks. June; fr. Aug. Eastern U. S., from Pa. south- 

 ward. 



101. TILIACEAE. Linden Family. 



1. TILIA L. 



1. Tilia americana L. Basswood. 



Rich woods, usually near water; frequent. May. Eastern N. Amer. 



Several European species, usually known as lindens, are cultivated as shade trees 

 along our ^streets. 



102. MALVACEAE. Mallow Family. 



Althaea cannabina L., a native of Europe, was reported by Ward as growing in waste 

 ground in east Washington, but has not been seen in many years. It resembles the 

 common mallow, Malva rotundifolia, from which it is easily distinguished by its 

 yellow flowers with purple center, and 6-9-bracted involucel. 



