382, Miihlenbergia, Volume 2 



Tabor, Mt. Scott, etc. April to June; brown-purple. A hand- 

 some plant in our woods, where its brdwn-pnrple and green cord- 

 ate leaves attract attention in spring long before it blooms. The 

 comniou name "nigger babies" given to it by children in Oregon 

 and Washington is certainly more appropriate to this plant than 

 it is to Sisynndiiiiin belhim^ to which it is applied in California, 

 as anyone can readily see who looks at the plant in full bloom, 

 when its purplish-brown flowers and long tailed calyx lobes so 

 strongly remind oneof asoutliein pickaninny in swaddling clothes 



POLYGONACEAE Lindl. Buckwheat Family. 



Persicaria [Tourn.] L. Dense spiked knotweed. 



Persicaria orkgana Greene. 4. Western water knotweed. 



[Polygomnn amphibiiini.) Not uncommon in wet ground, Lower 



Albina, Mock's bottom, Columbia slough, etc. June to August; 



rose color. 



Persicaria EMERSA(Michx.) Small. 4. Swamp knotweed. 

 {Poiygoiiurii Muhlcnbergii) In shallow water and wet ground. 

 Elk Rock, etc. June to September; rose color. 



Persicaria lapathifoua (L.) S. F. Gray. i. Pale knot- 

 weed. Wet ground, University Park, etc. Naturalized from 

 Europe. June to September; pink to white. 



Persicaria j.apathifoua nodosa (Pers.) i. {Polygonum 

 nodosum Pers. Syn. 1: 440. 1805.) Wet places, Lower Albina. 

 June to September; pink to white. 



Persicaria Persicaria (L) Small; i. Lady's thumb. 

 Moist ground, Lower Albina, Mock's bottom, Columbia slough, 

 Oregon City. Naturalized from Europe. May to September, 

 pink to purple. 



Persicaria hydropiperoides (Michx.) Small. 4. Mild 

 water pepper. Wet places and muddy borders of ponds, Bridgs- 

 ton, Kenton, Oregon City, etc. June to Sept.: pink or greenish. 



Persicaria Hydropjper (L.) Opiz. i. Smartweed. Moist 

 ground. Mock's Bottom, etc. June to Sept.; mostly greenish. 



X Persicaria punctata (Ell.) Small. 4. Dotted smart- 

 weed. W^et places, University Park, etc. May to Sept ; greenish. 



