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    Wind Cave

    National Park South Dakota

Seed Study - Penstemon grandiflorus

Penstemon grandiflorus - Shell Leaf Penstemon, Large Beardtongue

Penstemon grandiflorus - Shell Leaf Penstemon, Large Beardtongue

NPS Photo

Species: Penstemon grandiflorus
Common name: shell leaf penstemon, large beardtongue

Seedling identification: Cotyledons are tiny, narrow, pointed and waxy looking. Initially, when the true leaves emerge one is longer than the other, and the leaves are fairly narrow. As the leaves grow they widen at the center.

 

Penstemon grandiflorus – large beardtongue
Average number of good seeds per gram bulk matter: n.m.
Average number of good seeds per gram cleaned: 591
Commercial estimates of seeds per gram: 1212
Percent seed: 43
Percent live: 97
Collection dates: July 28; August 15 and 23
Collection effort: 21 grams in 8 person hours
Collection notes: Not a common plant and browsers often eat flower stalks. Also some of the seed collected was fungus damaged.
Cleaning notes: Clean seed measurement was pure hard seed.

Did You Know?

White Penstemon

White Penstemon is the most widespread penstemon or beardtongue in the Great Plains. The insides of the blossoms are bearded and often spotted with purple. More...