Key to Vitis

View taxon page for Vitis

(For a list of species in Vitis, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Flower 

bisexual 

Both male and female reproductive parts occurring and functional in the same plant or structure (e.g., flower, spikelet, inflorescence).

; fruit spheric to ovoid, skin adherent to pulp; stem hairy, generally glabrous in age ..... V. vinifera

1' Flower unisexual; fruit spheric or 0, skin separating from pulp; stem ± 

tomentose 

Covered with densely interwoven, generally matted hairs.

or glabrous

2. Leaf 

reniform 

Kidney-shaped; often pertaining to a leaf in which the blade base on both sides of the petiole is rounded and concave.

, glabrous, ± folded at midrib; stem climbing or not, < 1 m ..... [V. rupestris]

2' Leaf 

cordate 

Heart-shaped; often pertaining to a leaf in which the blade base on both sides of the petiole is rounded and convex.

to reniform, ± tomentose, not folded at midrib; stem climbing, > 1 m

3. Fruit purple, glaucous, generally > 8 mm wide if seeds 3–4; round structure 

opposite 

1. Arranged in pairs along an axis - e.g., two leaves per node. 2. Occurring in the same rank, directly above or below, as 'stamens opposite petals'. 3. Located directly across from.

 seed attachment 

scar 

Mark left by the natural separation of two structures, as a leaf scar on a stem.

generally raised; stipules generally < 3.5 mm; stem tomentose when young, less so in age, nodal partitions generally 3–4 mm thick ..... V. californica

3' Fruit black, ± not glaucous, generally < 8 mm wide if seeds 3–4; round structure opposite seed attachment scar generally sunken; stipules generally > 3.5 mm; stem densely tomentose in youth, ± remaining so in age, nodal partitions generally 2–3 mm thick ..... V. girdiana

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