OregonFlora species comparison

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Pontederia cordata

pickerel-weed
Habit Herbs perennial.
Roots

rhizomatous.
Stems

contracted when vegetative; erect when flowering, flowering stems to 120 cm.
Leaves

petiolate leaves emersed;

petioles constricted below blade; to 60 cm;

stipules 7–29 cm;

blades lanceolate to cordate, 6–22 × 0.7–12 cm, sessile leaves blades linear.
Inflorescences

spikes with up to several hundred flowers, 2–15 cm;

spathes 5–17 cm.
Flowers

tubes 3–9 mm;

limb lobes 5–8 mm;

distal central lobe with 2-lobed yellow spot;

proximal stamens 7–13 mm;

distal stamens 1.5– 7 mm;

style 3-lobed.
Fruits

4–6 × 2–3 mm, with dentate ridges.

Pontederia cordata
Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Streams, rivers, ponds, lakes. Flowering Jun–Sep. 0–50 m. Est, WV. East from Ontario, TX, and KS to the Atlantic Ocean. Exotic.

This species is considered a noxious weed in areas where it has been introduced. Like Heteranthera dubia, in high quantities this plant can cause an increase in local water pH.
Source Flora of Oregon, volume 1, page 493
Tamra Prior
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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