Voir la source de Discussion:Arroche

== À faire ==
Annual 5–18 dm
Stem generally 1, erect; branches ascending to erect, striate, sparsely scaly
Leaves: blade 15–120 mm, ovate to triangular, entire to finely toothed, green, glabrous to sparsely scaly; lower opposite; upper abruptly reduced, petioled
Pistillate inflorescence terminal; bracts in fruit 0 or 2, free, 8–18 mm, widely elliptic to ± round, smooth, clearly net-veined, entire
Pistillate flower: calyx 3–5-lobed (if bracts 0) or 0 (if bracts 2)
Seeds of 2 forms (1–1.5 mm and black if bracts 2 or 2–4 mm and brown if bracts 0)
Chromosomes: n=9
Ecology: Open, disturbed places
ref http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?3084,3089,3111