190 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



21. DOUCHOLUS Medic. 



1. Dolicholus erectus (Walt.) Vail. 



Dry aoil; rare. July-Aug. Southern states, north to Del. (Rhynchosia tomeniosa 

 of Ward's Flora; R. eiecta DC.) 



22. PHASEOLUS L. 



1. Phaseolus polystachyus (L.) B.S.P. Wild bean. 



Low thickets along the Potomac; rare. Aug. -Sept. Eastern U. S. (P. percnnis 

 Walt.) 



The common cultivated bean, Pkasc.olus vulgaris L., is sometimes found on garbage 

 dumps. 



23. STROPHOSTYLES Ell. Wild bean. 



Leaflets all entire; pods 3.5-5 cm. long, 4 mm. wide or narrower 1. S. umbellata- 



Leaflets, at least some of them, usually shallowly lobed; pods mostly 5-7 cm. long, 

 5-7 mm. wide 2. S. helvola. 



1. Strophostyles umbellata (Muhl.) Britton. 



Dry or moist soil; frequent. July-Aug. Eastern U. S. 



2. Strophostyles helvola (L.) Britton. 



Dry or moist soil; frequent. Aug. -Sept. Eastern N. Amer. (Phaseolus helvolus L.) 



24. PUERARIA DO. 



1. Pueraria thunbergiana (Sieb. & Zucc.) Benth. Kudzu vine. 



Becoming established in several localities. Native of Cbina; often cultivated for 

 ornament. 



It has been planted in the Zoological Park and elsewhere, and spreads rapidly. 



Vigna sinensis (L.) End!., the cow pea, is found occasionally in waste ground. 

 Native of Asia; widely cultivated and sometimes escaping, but not persisting in our 

 climate. ( V. catjang Walp.) 



Dolichos lablab L., the hyacinth bean, is sometimes found in waste ground. Native 

 of Asia; often cultivated for ornament and sometimes escaping, but not persisting 

 with us. 



84. GERANIACEAE. Geranium Family. 



Leaves pinnate, whh distinct leaflets; beaks of the fruit bodies spirally coiled at 

 maturity 1 . ERODIUM . 



Leaves palmately lobed; beaks of the fruit bodies merely recurved at maturity. 



2. GERANIUM. 

 1. ERODIUM L. 



1. Erodium cicutarium (L.) L'He'r. Alfileria. 



Old fields and waste ground; occasional. Apr.-June. Native of Eur. and Asia; 

 widely naturalized in N. Amer. 



2. GERANIUM L. GrANB's-BIIX. 



Plants perennial, with thick rootstocks; petals 12-17 mm. long 1. G. maculatum. 



Plants annual, with fibrous roots; petals 8 mm. long or shorter. 

 Peduncles much longer than the leaves; body of the fruit smooth and glabrous. 



Petals bright purple; seeds pitted 2. G. columbinum. 



Peduncles mostly shorter than the leaves; body of the fruit hairy or wrinkled. 

 Body of the fruit glabrous, wrinkled. Petals deep purple; seeds smoolh. 



3. G. rnolle. 

 Body of the fruit hairy, not wrinkled. 

 Petals deep purple: seeds pitted 4. G. dissectum. 



