TlLIACEAE 101 



petioled palmately-veined or lobed leaves; perfect or unisexual 

 polypetalous small and inconspicuous but fragrant flowers in 

 large compound panicles opposite the leaves; and small or 

 moderate 4- to 6-seeded berries. 



1. A tendril or flower-cluster opposite each rusty-woolly 



leaf. (Hybrids of, and) V. Labrusca. 



No tendril or flower-cluster at every third node. 2. 



2. Bark not flaking: pith not firmer at nodes. V. rotundifolia. 

 Bark flaking: pith with firm plates at the nodes. 3. 



3. Twigs angular, persistently gray-pubescent. V. cinerea. 

 Twigs rounded, glabrate. 4. 



4. Leaves woolly beneath when young. 5. 

 Leaves not woolly, bright green. 6. 



5. Leaves green beneath. V. aestivalis. 

 Leaves whitened beneath. V. bicolor. 



6. Leaves scarcely lobed. V. cordifolia. 

 Leaves sharply lobed. 7. 



7. Climbing: leaves roundish or elongated. 8. 



Bushy: leaves rather broader than long. V. rupestris. 



8. Nodal diaphragms thin: stem green. V. vulpina. 

 Diaphragms thick: stem red. V. rubra. 



Family TlLIACEAE. Linden Family. 

 A rather small family furnishing the tough "bass' formerly 

 much used for tying plants up, the very important fiber jute, 

 and the straight-grained basswood or whitewood, and an im- 

 portant source of honey; much planted as shade and street- 

 trees, especially in Europe. 



TILIA. Linden. Lime. Basswood. 



Deciduous trees with soft pale wood with minute scattered 

 ducts and very fine medullary rays; moderate terete twigs 

 with large bast-rays in the bark; round continuous pith; 2- 

 ranked alternate half-elliptical leaf-scars wih a number of 

 scattered bundle-traces; elongated stipule-scars; ovoid sessile 

 green or red buds with about 3 exposed scales, the terminal 

 bud lacking; rather large oblique or cordate petioled serrate 



