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|Family: Polygonaceae||View Description||Dichotomous Key|
|Genus: Polygonum||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Polygonum ramosissimum Michx.
Habit: Annual. Stem: erect, 10--100(200) cm, glabrous, green, ribbed, branches generally profuse in distal 1/2. Leaf: proximal often early-deciduous, distal < to >> flowers; ocreae 6--12(15) mm, proximally cylindric, distally soon disintegrating to brown fibers; petiole 2--4 mm; blade 8--70 mm, 4--18(35) mm wide, narrowly elliptic, lanceolate, or oblanceolate (ovate), light-yellow-green to -blue-green, margins flat, tip acute to acuminate or obtuse. Inflorescence: axillary, terminal, spike-like; pedicels included or exserted, 1--6 mm; flowers 2--5, crowded distally or not. Flower: closed; perianth (2)2.2--3.6(4) mm, green-yellow, margin green-yellow to yellow or white to pink, tube 20--38% of length, lobes overlapped, not keeled, elliptic to oblong, hood-shaped, midvein thickened or not; stamens 3--6(8). Fruit: included or exserted, 1.6--3.5 mm, ovate, dark-brown, shiny or dull, rough to generally smooth; late-season common, 4--15 mm. Chromosomes: 2n=60.
Note: An unnamed variant of Polygonum ramosissimum in saline marshes in SnFrB mistakenly identified as Polygonum patulum M. Bieb., may be taxonomically significant; study needed.
Synonyms: Polygonum patulum M. Bieb., misappl.
eFlora Treatment Author: Mihai Costea
Jepson Online Interchange
Previous taxon: Polygonum polygaloides subsp. kelloggii
Next taxon: Polygonum ramosissimum subsp. prolificum
Citation for this treatment: Mihai Costea 2016. Polygonum ramosissimum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=39272, accessed on September 29, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on September 29, 2016.