CROWFOOT FAMILY 



205 



12. Ranunculus arvensis L. Field Buttercup or Hunger Weed. Fig. 1833. 



Ranunculus arvensis L. Sp. PI. 555. 1753. 



Annual, stems mostly solitary, erect, 1.5-5 dm. long, slightl 



cuneate-obovate, 1.5-3.5 cm. long by 1.5-4.5 cm. broad, deeply 3- 



late, sometimes again shallowly lobed, glabrous or thinly pubescent 



6-7 mm. long, pubescent ; petals 5, yellow, 6-8 mm. long ; stamens 



short-stalked, obovate, 5 mm. long, compressed, faces with short 



produced into long spines, beak curving dorsally, stout ; receptacle 



hairy at the summit. 



Fields, Transition and Upper Sonoran Zones; naturalized in Yamhill 

 southern part of Oregon, also in Mendocino and Mariposa Counties, California 

 Europe. July-Sept. 



y hairy above. Basal leaves 

 parted, lobes obovate-lanceo- 

 ; sepals spreading, lanceolate, 

 10-15; achenes 5 in a whorl, 

 spines, the thickened border 

 slightly 



not enlarged in fruit 



and Marion Counties and in the 

 ; eastern United States. Native of 



13. Ranunculus muricatus L. Prickle-fruited Buttercup. Fig. 1834. 



Ranunculus muricatus L. Sp. PI. 555. 1753. 



Glabrous perennial, stems several, reclining, usually stout, 2-4 dm. long. Basal leaves broadly 

 cordate or else suborbicular and truncate at the base, 2-4 cm. long by 2-4.5 cm. broad, deeply 



1833 



1834 



1836 



1837 



1838 



1833. Ranunculus arvensis 



1834. Ranunculus muricatus 



1835. Ranunculus parviflorus 



1836. Ranunculus hebecarpus 



1837. Ranunculus sardous 



1838. Ranunculus cardiophyllus 



