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Needle Grass, Porcupine Grass (Hesperostipa)

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Needle Grass, Porcupine Grass Genus Details

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Needle grass is native to hillsides and prairies in central North America. It is clump forming, upright and grows to 3 feet tall when flowering. Needle grass is remarkable for the flowing, bristle-like appendages, called awns, which reach up to 8" long. Threadlike and translucent, they shimmer and sparkle in the sun as breezes blow across the prairie. Needle grass is easy to grow in full sun on most soils of average moisture.

Needle Grass, Porcupine Grass Allergy Info

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Although the grass family in general is considered significant allergenically, this genus is not typically considered to be problematic.

Needle Grass, Porcupine Grass Pollen Description

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Grains are spheroidal to ovoidal, sometimes elliptical. The exine is thin and the surface is granular to finely reticuloid. Poaceae apertures are 1-porate, with the pores usually circular to ovoidal.
Grains are 22-122 micrometers in diameter.
This plant belongs to the grass family.  All pollen grains in this family are similar to the Poaceae (grass) grain pictured here. Herb. MIN
This plant belongs to the grass family. All pollen grains in this family are similar to the Poaceae (grass) grain pictured here. Herb. MIN
This plant belongs to the grass family.  All pollen grains in this family are similar to the Poaceae (grass) grains pictured here. Herb. MIN
This plant belongs to the grass family. All pollen grains in this family are similar to the Poaceae (grass) grains pictured here. Herb. MIN

Species in This Genus

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Allergenicity Legend:
Mild Allergen Mild Allergen  |  Moderate Allergen Moderate Allergen  |  Severe Allergen Severe Allergen  |  Allergy Test Allergy Test Available
Needle Grass, Porcupine Grass (Hesperostipa) is a genus of the POACEAE family.
This genus includes the following allergenic species:

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Needle Grass, Porcupine Grass Genus Location

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The shaded areas on the map indicates where the genus has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed

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