VITACEAE 



753 



sperm cartilaginous, sometimes channeled. Embryo at the base of the endo- 

 sperm. 



Hypogynous disk present, either annular, cup-shaped or glandular : leaf-blades simple or ternately 



compound. 

 Petals cohering into a cap, caducous, never separating. 



Bark shreddy: pith interrupted by diaphragms at the nodes : tendrils forking. 1. VITIS. 



Bark not shreddy : pith continuous through the nodes : tendrils simple. 2. MUSCADINIA. 

 Petals distinct, spreading. 



Floral envelopes mostly in 4's : disk 4-lobed : plant-tissues fleshy. 3. Cissus. 



Floral envelopes mostly in 5's : disk entire or nearly so : tissues not fleshy. 4. AMPELOPSIS. 



Hypogynous disk wanting or obsolete : leaf-blades digitately 5-7-foliolate. 5. PARTHENOCTSSTJS. 



1. VITIS L. 



Trailing or climbing vines, with a shreddy bark and forking tendrils. Pith interrupted 

 at the nodes by diaphragms. Leaves alternate : blades simple, palmately lobed, angled or 

 coarsely toothed, petioled. Stipules usually small, caducous. Flowers dioecious, polyg- 

 amo-dioecious or rarely perfect, in elongated racemes, or panicles. Disk hypogynous, 

 often glandular. Calyx minute. Corolla caducous : petals cohering at the top like a cap. 

 Stamens exserted, alternating with the lobes or glands of the disk. Ovary 2-celled or 

 rarely 3-4-celled : styles short or conic. Ovules 2 in each cavity. Berries juicy, mostly 

 edible. Seeds few, pear-shaped with a constricted beak-like base. GRAPE. 



Leaf-blades green and glabrous beneath at maturity or merely cobwebby about the nerves or in their 

 axils. 



Leaf-blades merely toothed, or sometimes angled or shallowly lobed. 

 Low shrub. 



1. V. rupesirie. 



Elongated trailing or climbing vines. 

 Diaphragms thin. 



Berries less than 14mm. in diameter. 2. V. monticola. 



Berries over 15 mm. in diameter. 3. V. Champinii. 



Diaphragms thick. 



Shoots terete, glabrous or early becoming so. 



Leaf-blades long-pointed, the teeth rather triangular, acute. 4. V. cordtfolia. 



Leaf-blades mostly rounded at the apex, the teeth rounded and 



mucronate. 6. V. Helleri. 



Shoots angled, pubescent throughout the year. 



Leaf-blades not lustrous on either side : seeds 3-4 mm. long. 6. V. Baileyana. 



Leaf-blades lustrous above and often below : seeds 4-5 mm. long. 7. V. Berlandieri. 

 Leaf-blades prominently lobed. 



Lobes and sinuses of the leaf-blades acute : berries with a bloom. 



Young foliage glabrous or essentially so : petioles green. 8. V. vulpina. 



Young foliage manifestly pubescent : petioles white-flocculent. 9. V. Longii. 



Lobes of leaf-blades acuminate: sinuses obtuse: berries destitute of any bloom. 10. V. palmata. 

 Leaf-blades densely woolly, or glaucous and sparingly pubescent beneath. 



Lower surface of leaf-blades glaucous, glabrate. 11. V. Ucolor. 



Lower surface of leaf-blades more or less densely woolly. 

 Leaf-blades cobwebby or flocculent beneath at maturity. 

 Young foliage gray-cobwebby or white-tomentose. 



Leaf-blades densely white-tomentose beneath. 12. V. Doaniana. 



Leaf-blades gray-cobwebby beneath. 13. V. cinerea. 



Young foliage ferrugineous-pubescent, at least on the nerves of the leaf- 

 blades. 

 Twigs, and often the expanding leaves, clothed with a close felt-like 



pubescence. 

 Berries mostly less than 10 mm. in diameter, not glaucous : Floridian 



species. 14. V. austrina. 



Berries mostly over 10 mm. in diameter, glaucous : Texan species. 15. V. Linsecomii. 

 Twigs, and expanding leaves, more or less densely tomentose. 



Twigs and petioles copiously tomentose : panicle-branches felty- 



flocculent during anthesis. 



Leaf-blades not lobed, except on the shoots, the margins shal- 

 lowly sinuate-toothed. 16. V. Caribaea. 

 Leaf-blades usually manifestly lobed, the margins coarsely toothed. 17. V. rufotomentosa. 

 Twigs, and often petioles, glabrous or nearly so : panicle-branches 



not felty-flocculent. 18. V. aestivatts. 



Leaf-blades felt-like or densely tomentose beneath at maturity. 



Tendrils, or flower-clusters' intermittent, usually every third node with- 

 out tendril or inflorescence. 

 Leaf-blades densely tomentose with white hairs. 



Berries over 12 mm. in diameter. 19. V. candicans. 



Berries less than 12 mm. in diameter. 20. V. coriacea. 



I hairs. 21. V. Simpsonii. 



, or inflorescence. 22. V. Labrusca. 



1. Vitis rupe~stris Scheele. Bushy, 1-2 m. tall, sometimes slightly climbing. Leaf- 

 blades commonly broader than long, reniform to ovate-reniform, 4-10 cm. in diameter, 

 coarsely toothed and rarely slightly and sometimes somewhat irregularly lobed, and with an 

 abrupt tip at the apex, mostly lustrous above, glabrous or sparingly pubescent on the nerves 



48 



Leaf-blades densely tomentose with rusty or tawny 

 Tendrils continuous, usually every node with a tendril, 



