Allergenic Weeds of Texas

Cells Marked With () signify taxon present in area.
Cells Marked With () signify marginal or occasional presence.
Unmarked Cells signify taxon absent in area or unconfirmed.

Cross-reactive species grouped together in colored cells
2 Italicized species demonstrate only moderate cross-reactivity with other(s) in the group
3 This species is insect-pollinated

Most weeds pollinate in the fall.

Cross-Reactive Weeds 1

32: Careless Weed

x

x

x

x

x

x

49: Palmer's Amaranth

x

x

x

x

x

x

x

x

x

52: Pigweed, Rough/Redroot :

x

x

x

x

x

53: Pigweed, Spiny :

x

x

x

x

x

x

40: Hemp, Water

x

x

x

x

44: Marsh Elder, Burweed :

x

45: Marsh Elder, True/Rough :

x

x

x

x

x

185: Ragweed, False :

x

x

55: Ragweed, Giant :

x

x

x

x

x

56: Ragweed, Short :

x

x

x

x

x

58: Ragweed, Western :

x

x

x

x

x

x

x

x

x

199: Saltbush, Annual

x

206: Wingscale :

x

x

x

x

x

Other Weeds

225: Baccharis :

x

x

x

x

x

33: Cocklebur :

x

x

x

x

x

x

x

x

x

35: Dock, Yellow/Curly :

x

x

x

x

Dock/Sorrel, other

x

x

x

x

x

x

x

x

x

212: Iodine Bush :

x

42: Kochia/Firebush :

x

43: Lamb's Quarter :

x

x

x

x

36: Nettle :

x

x

x

x

x

x

54: Plantain, English :

x

x

x

x

x

48: Sage/Darklf. Mugwort :

x

x

x

x

x

x

x

x

x

59: Russian Thistle :

x

x

x

x

Data obtained from USDA Plants Database.

For current pollen counts visit www.pollen.com or enter a zip code below.

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