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Wind Cave National ParkFalse Gromwell Seedling
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Wind Cave National Park
Seed Study - Penstemon grandiflorus
Penstemon grandiflorus - Shell Leaf Penstemon, Large Beardtongue

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Penstemon grandiflorus - Shell Leaf Penstemon, Large Beardtongue

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.
Caver surveying through a small passage in Wind Cave  

Did You Know?
With more than 132 miles (212 kilometers) of explored passages, Wind Cave is the 4th longest cave in the world. The cave is still being explored.

Last Updated: September 14, 2007 at 11:46 EST