68 IOWA ACADEMY OF SCIENCE 
LATHYRUS (Tourn) L. 
556. Lathy rus palustris L. Marsh Vetchling. Very common in moist 
soils. 
557. Lathy rus palustris Yar. pilosus (Cham.) Ledeb. Winged Marsh 
Vetchling. Locally plenty with above. 
558. Lathy rus palustris Yar. myrtifolius (Mnhl.) Gray. Myrtle-leaved 
Marsh Vetchling. Common with above. 
559. Lathyrus ochroleucus Hook. Cream Colored Vetchling. Rare in 
deep woods. 
APIOS (Boerh) Lud. 
560. Apios tuherosa Moench. Ground Nut. Common in bogs and 
marshes. 
STROPHOSTYLES Ell. 
561. Strophostyles helvola (L.) Britton. Trailing Wild Bean. Com- 
mon in open places in sandy soil. 
562. Strophostyles paucifiora (Britt) Wats. Small Wild Bean. Abun- 
dant in similar locations, 
AMPHICARPA Ell. 
563. Amphicarpa monoica (L.) Ell. Hog Peanut. Common in woods. 
564. Amphicarpa pitcheri T. & G. Pitcher’s Hog Peanut. Less com- 
mon but not rare. 
LINACEAE. 
LINUM (Tourn) L. 
565. Linum sulcatum Riddell. Grooved Yellow Flax. Common in dry 
soil in open places. 
566. Linum usitatissimum L. Flax or Linseed. Common as an escape 
along railways. 
OXALID ACE AE . 
OXALIS L. 
567. Oxalis violacea L. Violet Wood Sorrel. Common m woods and 
fields. 
568. Oxalis stricta L. Upright Yellow Wood Sorrel. More abundant 
than the above, in dry or sandy soils. 
569. Oxalis corniculata L. Tall Yellow Wood Sorrel. Common in fields 
and thickets. 
