Podostemum ceratophyllum

Michaux
Fl. Bor.-Amer. 2: 165, plate 44. 1803.
Common names: Podostémon à feuilles cornées
Illustrated
Synonyms: Lacis ceratophylla (Michaux) Bongard Podostemum abrotanoides Nuttall P. ceratophyllum var. abrotanoides (Nuttall) Weddell P. ceratophyllum var. circumvallatum P. Royen P. ceratophyllum var. fluitans Weddell
Treatment appears in FNA Volume 6. Treatment on page 70.

Roots flattened or elliptic, 0.3–1.1 mm diam. Stems 1.8–9 mm apart, 0.4–300 × 0.5–1.5 mm at base. Leaves: stipules caducous (absent from leaves 3–9 nodes back from stem apex), 0.5–3.6 mm, margins entire; petiole arising perpendicular to stem axis or upright, 0.4–59 mm; blade 1–13 times dichotomously divided, 1.7–142 mm, ultimate divisions flattened, spatulate, linear, or awl-shaped, 0.2–40 × 0.05–0.8 mm, central vein faint or absent. Inflorescences: spathella 1.5–6.2 × 0.8–1.8 mm. Pedicels 0.4–2.9 mm, to 0.6–10.5 mm in anthesis, 0.5–9 mm in fruit. Flowers: tepals linear or awl-shaped, apex acute, lateral tepals 0.7–2 mm, andropodial tepals 0.1–1.1 mm; andropodium 0.1–3.3 mm, 0.7–4.3 mm in anthesis; filaments 0.2–0.9 mm, 0.3–2 mm in anthesis; anthers 0.5–1.5 × 0.4–0.8 mm; ovary 0.7–2.6 × 0.4–1.4 mm; stigmas 0.3–1.4 mm, 0.4–1.5 mm in anthesis. Capsules 1.4–3.1 × 0.7–1.7 mm. Seeds 0.4–0.8 × 0.5–0.8 mm.


Phenology: Flowering Jun–Sep.
Habitat: Attached to rocks and other solid substrata in swift currents
Elevation: 0–800 m

Distribution

V6 112-distribution-map.jpg

N.B., N.S., Ont., P.E.I., Que., Ala., Ark., Conn., Ga., Ky., La., Maine, Md., Mass., Miss., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Vt., Va., W.Va., West Indies (Dominican Republic), Central America (Honduras).

Discussion

Podostemum ceratophyllum is listed as rare, endangered, or of special concern in some regions. Paucity of appropriate habitat and human disturbances (for example, siltation, damming) have contributed to conservation concerns.

Selected References

None.

Lower Taxa

None.

... more about "Podostemum ceratophyllum"
C. Thomas Philbrick +  and Garrett E. Crow +
Michaux +
Podostémon à feuilles cornées +
N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Ala. +, Ark. +, Conn. +, Ga. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Miss. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, W.Va. +, West Indies (Dominican Republic) +  and Central America (Honduras). +
0–800 m +
Attached to rocks and other solid substrata in swift currents +
Flowering Jun–Sep. +
Fl. Bor.-Amer. +
Illustrated +
Lacis ceratophylla +, Podostemum abrotanoides +, P. ceratophyllum var. abrotanoides +, P. ceratophyllum var. circumvallatum +  and P. ceratophyllum var. fluitans +
Podostemum ceratophyllum +
Podostemum +
species +