165 
(Polygonum aviculare, continued) 
accepted by S: apparently are nomenclaturally 
equivalent to P. aviculare, the plants earlier assigned to 
these varieties show little consistency as to actu 
determinations; much work will be necessary to 
compile accurate distributional maps for each of the 
segregate species within the P. aviculare complex), 
5 
P. bicorne Raf., pink smartweed [Persicaria bicornis (Raf.) Nieuwl.] 
(note that Mitchell and Dean (1978) have expressed 
reservations as to the distinctness of this taxon from 
‘olygonum pensylvanicum), p. 5 
P. buxiforme Small, knotweed [S: Polygonum aviculare] (Mitchell 
and Dean, 1978), p. 586 
+P. cespitosum Blume [Persicaria cespitosa (Blume) Nakai], p. 592 
var. longisetum (Bruijn) Steward 
+P. convolvulus L., black bindweed, climbing buckwheat, wild 
buckwheat [Fallopia convolvulus (L.) A. Live], p. 597 
+P. cuspidatum Siebold & Zucc., Japanese knotweed, Mexican 
bamboo, Japanese bamboo [Reynoutria japonica 
Houtt.], p. 597 
var. cuspidatum 
*var. compactum (Hook. f.) L. Bailey (Miihlenbach, 1983) 
(note that this variation might best be treated as 
c 
P. densiflorum Meissner [Persicaria densiflora (Meissner) Mold.}, 
588 
p- 
P. erectum L., erect knotweed, p. 586 
P. hydropiper L., water pepper, smartweed [Persicaria hydropiper 
Opiz], p. 591 
P. hydropiperoides Michaux, wild water pepper, mild water pepper 
(Persicaria hydropiperoides (Michaux) Small; S: incl. 
var. hydropiperoides f. strigosum (Small) Stanford, var. 
opelousanum (Riddell ex Small) Stone; M: incl. 
Polygonum opelousanum Riddell ex Small] (Horton, 
1972; McDonald, 1980), p. 593 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
