Angiosperms (Flowering Plants) • Earth.com

Hornleaf Riverweed

(Podostemum ceratophyllum)

galery
en

Description

Lacis ceratophylla-(Michaux) Bongard;-Podostemum abrotanoides-Nuttall;-P. ceratophyllum-var.-abrotanoides-(Nuttall) Weddell;-P.-ceratophyllum-var.-circumvallatum-P. Royen;-P.-ceratophyllum-var.-fluitans-Weddell;-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.

Taxonomic tree:

Domain:
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order:Malpighiales
Family:Podostemaceae
Genus:Podostemum
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