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Species
Polygonum lapathifolium L.
IUCN
NCBI
EOL Text
This annual plant is about 2½–4' tall, branching occasionally. The stems are light green, terete, hairless, and somewhat swollen at the petiole bases. The alternate leaves are up to 8" long and 2" across; they are medium to dark green, lanceolate, glabrous or slightly pubescent, and their margins are smooth. At the petiole bases, there are membranous sheaths (ocreae) that wrap around the stems. These sheaths often have longitudinal ribs, but they lack bristles along their upper margins. With age, the sheaths gradually turn brown and peel away. The upper stems terminate in spike-like racemes of flowers. These racemes are about 2-8" long, and they droop conspicuously downward. The small flowers are densely crowded together along the length of each raceme. Each flower is about 1/8" long, consisting of 5 tepals and the reproductive organs. These tepals are usually white or greenish white; less often they are light pink. Because the flowers don't open fully, the inner tepals can be difficult to observe. The flowers have inconspicuous pedicels (less than 1 mm. in length). The blooming period occurs from mid-summer to early fall, and lasts about 1½-2 months. There is no noticeable floral scent. The seeds are dark brown or black, ovoid and bluntly 3-angled in shape, and up to 2 mm. across. The flattened sides of the seeds are slightly concave and their surfaces are shiny. The root system is shallow and fibrous. This plant spreads by reseeding itself, often forming colonies at favorable sites.
License | http://creativecommons.org/licenses/by-nc/3.0/ |
Rights holder/Author | Copyright © 2002-2014 by Dr. John Hilty |
Source | http://www.illinoiswildflowers.info/wetland/plants/heartease.htm |
Jilin, Xinjiang [Kazakhstan, Kyrgyzstan, Mongolia, Russia (Far East, E Siberia), Tajikistan].
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242414799 |
Roadsides, along ditches, field margins, watersides; sea level to 3900 m.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006724 |
Population
There is no information about population of this species.
Population Trend
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
Source | http://www.iucnredlist.org/apps/redlist/details/176973 |
Persicaria attenuata (R. Br.) Sojak , 1974
License | Public Domain |
Rights holder/Author | No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation. |
Source | http://treatment.plazi.org/id/C9FB705C09D122FAD2EEE447262748AF |
VII, VIII, IX, X, Juan Fernandez
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | Pablo Gutierrez, IABIN |
Source | No source database. |
In shallow water of swamps, marshy areas; 100-300 m.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242339693 |
Population: There is no information about population of this species. Population Trend: Unknown
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/228023 |
"Red List Category & Criteria: Least Concern ver 3.1 Year Assessed: 2010 Assessor/s: Mani, S. Reviewer/s: Rao, M.L.V., Bhat, G.K. & Dahanukar, N. Contributors: Molur, S. Justification: Persicaria attenuata is a widely distributed species with no threats, hence assessed as Least Concern. Conservation Actions: No conservation actions are known or needed for this species."
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/228023 |
Annual, erect or ascending, 20-60 cm tall, annual herb, glabrous or pubescent. Stem simple or branched, often thickened at the nodes, usually with red dots, internodes usually shorter than the leaves. Leaves distinctly petiolate, linear lanceolate, acute to acuminate, (1.5-) 2-10 (-12) x 0.5-2.0 (-2.5) cm, entire, ciliate on margins, midrib and veins, ± tomentose below or glabrous (var. nodosa) sometimes covered with yellow glands. Ochrea 5-20 (-30) mm long, tubular, ovate, ± brownish entire-dentate, eciliate, rarely very finely ciliate at the mouth. Inflorescence many flowered dense, pedunculate, uninterrupted or lax, 1-5 cm long, curved or stiff raceme; peduncle as long as the inflorescence or less, glandular or not. Flowers up to 2.5 mm across, subsessile to pedicellate, pedicel 0.5-1 (-1.5) mm long. Ochreolae 0.5-3 mm long, ovate, acuminate, eciliate, entire to dentate. Tepals 4-5, in two whorls, pink or white or greenish with a reddish tinge, unequal, elliptic-obovate, obtuse, entire. c. 2.0 x 0.75 mm, glandular, glands sessile, yellow. Stamens 5-6 (-8), filaments long, unequal, ovary biconvex, c. 1 mm long, with two styles, styles filiform, free above, fused below, stigmas capitate. Nuts 2-3.5 x 1.5-2.0 mm, biconvex, slightly compressed in the middle, circular to broadly ovate, shining, black-brown.
A fairly common and widespread species, grows from plains to 3000 m in moist and shady areas. A highly polymorphic taxon especially in habit, presence or absence of red dots on the stem, colour of the glands on the leaves and perianth, tomentose to almost glabrous leaves, eglandular to glandular peduncle and length and compactness of raceme. The variation in our area in most of the characters is continuous. However, the character of leaf indumentum and length and compactness of raceme seem to be fairly stable. Therefore two varieties are recognized in our region.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=242100098 |