by Nathaniel Lord Britton & Addison Brown, An Illustrated Flora of the Northern United States… (1913)
“ Pistil solitary; ovary superior, 1-celled; ovule solitary, orthotropous, erect or pendulous; style 2- or 3-cleft or 2- or 3-parted (rarely 4-parted) , sometimes very short; stigmas capitate or tufted, rarely 2-cleft or toothed; fruit a lenticular. 3-angled or rarely 4-angled achene, usually invested by the persistent calyx ”
by Nathaniel Lord Britton & Addison Brown, An Illustrated Flora of the Northern United States… (1913)
“ About 40 genera and 800 species, of wide geographic distribution. •Flowers or flower-clusters subtended by involucres. •Ocreae present; calyx 2-4-parted; stamens 3 or fewer.style="vertical-align:bottom; text-align:right" |1.Macounastrum. •Ocreae none; calyx 6-cleft or 6-parted; stamens 9; achene 3-angled.style="vertical-align:bottom; text-align:right" |2.Eriogonum. •Flowers or flower-clusters not involucrate; stamens 4-8. •Stigmas tufted; sepals of the inner row usually accrescent. •Calyx 6-parted; style 3-parted; achene 3-angled.style="vertical-align:bottom ”
