Handb. Nat. Pfl.-Syst.,236. 1837
w North America, Europe, Asia.
Species ca. 25 (3 in the flora).
The orthography of and author citation for the genus name have been matters of confusion. Meisner published the taxon as Polygonum sect. Aconogonon. Reichenbach elevated it to generic rank and changed the orthography, apparently deliberately, to Aconogonum. Debate centers on whether Reichenbach’s name is new (Aconogonum Reichenbach) or should be treated as Meisner’s section name elevated to generic rank [Aconogonon (Meisner) Reichenbach]. Following established custom, we here use Aconogonon.
Aconogonon often is treated as a section of Persicaria (L.-P. Ronse Decraene and J. R. Akeroyd 1988); pollen morphology, inflorescence type, and seed and stem anatomy have been used by some taxonomists for segregation at the generic level (K. Haraldson 1978; Hong S. P. 1991).
Aconogonon campanulatum (Hooker f.) H. Hara is planted as an ornamental. C. L. Hitchcock and A. Cronquist (1973) reported it as escaping and probably established west of the Cascade Mountains, especially in Seattle, Washington. P. Zika (pers. comm.) searched numerous herbaria in the Pacific Northwest. He found no voucher indicating that A. campanulatum has escaped there, although it is cultivated occasionally in the Seattle area; it therefore is excluded here.
|1||Inflorescences axillary, racemelike; plants 12-42(-50) cm; leaf blades oblong-ovate to ovate, rarely broadly lanceolate, 2.1-7.5(-9.7) × 1.1-5 cm, often glaucous||Aconogonon davisiae|
|1||Inflorescences usually terminal or subterminal, sometimes also axillary, paniclelike; plants (30-)50-150(-200) cm; leaf blades narrowly lanceolate to ovate, 5-20 × 1.4-8 cm, not glaucous||> 2|
|2||Achenes 2.6-3.8 mm, included or exserted, tan to grayish, faces usually not concave; inflorescences terminal, sometimes also axillary; Alaska, n Yukon, nw Northwest Territories||Aconogonon alaskanum|
|2||Achenes (3-)3.8-7 mm, usually exserted, yellowish brown, faces concave; inflorescences usually terminal, subterminal, and axillary; n California, Oregon, Washington, Idaho, w Montana, n Nevada||Aconogonon phytolaccifolium|
|Author||Harold R. Hinds† + and Craig C. Freeman +|
|Basionym||Polygonum Aconogonon +|
|Etymology||Greek acon, whetstone, and gone, seed, perhaps alluding to rough seeds +|
|Illustrator||Yevonn Wilson-Ramsey +|
|Reference||hinds1995a + and hong1991a +|
|Taxon name||Aconogonon +|
|Taxon parent||Polygonaceae subfam. Polygonoideae +|
|Taxon rank||genus +|
|Volume||Volume 5 +|