^ 



272 PLANT NAMES AND SYNONYMS 



a. 0. ftliformis (Walt.) Brit. (Oe. filiformis Walt., Ox. tereli- 



foliaKaf. ). Southeastern U. S. False Dropwort, Oxypolis^. 



b. 0. rigida ( L. ) Raf. ( S. rigidum L. , A. rigida DC. , P. ternatuin 



Nutt. (Kew), A. ternata Nutt. ). Eastern U. S. Cowbane, 

 Hemlock Dropwort, Water Dropwort, Pig Potato. 



1480. OXYRIA, Hill. Moiintaiu Sorrel. Poljgonaceae. 



From Greek, "sour". Syn. Acetosa, Rumex, in part. 

 Fleshy herbs with acid foliage. Two known species, north 

 temperate zone; 1 in U. vS. 



a. 0. digyna (L. ) Hill (R. digynus L., A. digyna Mill., O. renifor- 

 misHook. ). Northern Europe, Asia and N. America, south to 

 New Hampshire and Colorado. Mountain Sorrel, Round-leav- 

 ed Sorrel, Sour Dock, Boreal Sour Dock. 



1481. OXYSTYLIS, Tor. & Frem. Oxystylis. Capparidaceae. 



From Greek, ''sharp style". Herb with small yellow flowers. 

 A single species, California. 



1482. OXYTENIA, Nutt. Oxytenia. Compositae. 



From Greek, "pointed", alluding to the leaves. Shrubby 



plant resembling Artemisia. One species, California to Colo- 

 rado. 



1483. OXYTHECA, Nutt. Oxytheca. Polygonaceae. 



From Greek, "pointed case". Annuals resembling Eriogo- 

 num. About 10 species, N. America; 8 in western U. S. 



1484. OXy'tRIA, Raf. 1836. Oxytria. Liliaceae. 

 Syn. Schoenolirion, Tor. 1855. Scapose herbs. About S 



species, southwestern U. S. 



1485. PACHYLOPHUS, Spach. Scapose Primrose. Onagraceae. 



From Greek, "thick crest". Syn, Oenothera (Kew), in 

 part. Scapose herb with white or pink flowers. One species^ 

 central U. S.^ 



1486. PACHYSANDRA, Michx. Pachysandra. Buxaceae. 

 From Greek, ' 'thick stamen' ' . Monoecious perennial herbs. 



Two species, one of Japan, one of southeastern U. S. ; (a) P. 

 prociimbens Michx. Alleghany Mountain Spurge. 



1487. PACHYSTIMA, Raf. (Pachystima). Celastraceae. 



Syn. Oreophila, Nutt. Evergreen shrubs. Two species, both 

 of U. S. 



1488. PAEONIA, L. - Peony. - Ranunculaceae. 



The ancient Greek name, from Pjson, the physician of the 

 gods. Herbs, some shrubby. About 10 species, north temper- 

 ate zone; 1 in U. S. 



a. P. Moutan Simson. Japan and China. Tree Peeony, Botan 

 (Japan), Moutan (China-meu-tang, King of flowers). 



