Ludwigia leptocarpa (Nutt.) H.Hara

국표에 없다.

Synonyms: Jussiaea leptocarpa Nuttall.

Varieties: none.

The specific epithet L. leptocarpa means slender-fruited.

Description

“Repent or erect, usually branched, short-lived perennials, or rarely annual. Floral parts in 4-7’s; hypanthium is not prolonged beyond the ovary. Capsules longitudinally or poricidally multiseriate, rarely uniseriate. Most of the erect species produce basal offshoots, which have ovate to obovate leaves, in the late summer and fall. Bracteoles occur in pairs on the pedicel or stipe or the base of the hypanthium.”

"Stems erect, branched, pubescent, to 1 m tall. Leaves alternate, elliptic, pubescent, to 12 cm long and 3 cm wide; sessile or subsessile. Sepals 5-7, lanceolate, pubescent, 4.5-7 mm long, 2-3 mm wide; petals 5-7, 5.5-7.5 mm long, 4-8 mm wide. Capsules cylindric, 2-5 cm long, 2-3.5 mm in diam.; bracteoles subulate, ca. 0.5 mm long; pedicels absent or to 2 cm long; seeds uniseriate, free inside brownish endocarp."

Distribution

This plant ranges from Virginia to central peninsular Florida, west to eastern Texas, and north along the Mississippi and Ohio rivers to southeast Missouri, southern Illinois, and western West Virginia. It also grows in tropical America. Individuals occurring at the northern edge of the range in North America behave as an annual species while those in the southern range are perennial.

Ecology

Habitat

Habitats of L. leptocarpa in the Coastal Plain in Florida include lake margins, around cypress ponds, wet ditches bordering swamps, drainage ditches bordering pine flatwoods, wet sloughs, inter-dune ponds, and growing on decaying vegetation. It has been observed growing in disturbed areas such as roadways and Kudzu dominated seepage areas. Soil types include sandy loam, loamy sand, sandy soil, peaty sand, and sandy peat. Associated species include Cephalanthus occidentalis, Eupatorium compositifolium, Hypericum walteri, Ludwigia decurrens, Nymphaea odorata, Panicum, Polygonum hirsutum, Salix nigra, Utricularia subulata, L. decurrens, and L. sphaerocarpa.

In rice paddies and other cultivated swampland, it can become a serious weed.

Phenology

L. leptocarpa flowers from June through October. Reproduction can be either vegetative or sexual. Depending on the location, it can be either an annual or perennial species.

Seed dispersal

The seeds have a specialized endocarp that remains attached and enable the seed to float. The seed capsule length is highly correlated with seed number.

Ludwigia leptocarpa (Nutt.) H.Hara | Plants of the World Online | Kew Science

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