|
(Last Modified On 9/19/2013)
|
|
|
|
(Last Modified On 9/19/2013)
|
|
Species
|
Ceratophyllum demersum L.
|
|
PlaceOfPublication
|
Sp. PI. 992. 1753.
|
|
Note
|
LECTOTYPE: Europe, herb. Linnaeus (LINN 1122.1, not seen; MO, microfiche).
|
|
Description
|
Dissected submerged aquatic herbs; stems green, glabrous or with sparse weak trichomes, to 0.5 mm in diam., to 3 m long, branching, flexuous; roots lacking. Leaves verticillate, often 6-10 at a node, linear to filiform, flat, dichot- omously branching 1-3 times, the ultimate segments ca. 0.5 mm wide, mostly 0.75-1.5 cm long, sparingly irregularly serrate, the teeth often projected into a transparent cusp. Inflorescences solitary axillary flowers; pedicels short. Flowers unisexual, minute, sometimes pinkish, calyx of ca. 10 sepals, basally connate, narrowly deltoid, ca. 1 mm long, the staminate flowers with the ca. 10 stamens spiralling on a flat torus, filaments obsolete, the anthers linear; the pistillate flow- ers with a single superior, 1-carpellate ovary, the ovule 1. Fruit a tuberculate nut, ca. 1.5 mm long, mostly cuspidate.
|
|
Note
|
This species may be recognized by its dissected, flat verticillate leaves and the branching of the stems.
|
|
Distribution
|
found in still fresh waters in most temperate and tropical countries in the world. In Panama it has been collected in the Canal and in lowland waters adjacent to it.
|
|
Specimen
|
CANAL ZONE: Rio Mandinga near Bamboa, 1 mi up from Canal, Kennedy 2375 (MO). 3 mi above Gamboa on Chagres River, Lazor & Boreham 2927 (MO). Gatin Lake and Chagres River, Lazor & Tyson 5702 (MO). Railroad and Panama Canal 6 km W of Gamboa, 30-40 m, Nee 7210 (MO). Chagres River 1/2 mi N of Gamboa, Nee 8730 (MO). Edge of Caimitillo Arm, a bay of Miraflores Lake, Nee 10194 (MO).
|
|
Tag
|
|
|
|
Project Name
|
|
Tag
|
|
|
|