ZANTHOXYLACE.E. G7 



Mountain woods. Can. Mass. N. Y. and Penn. June. 1\.. Scape 3 5 inches 

 long. Flowers large, white, with red veins, drooping. Petals slightly emargi- 

 nate. This is the Shamrock of the Irish. The expressed juice yields binoxate 

 of potash. Common Wood Sorrel. 



2. O. violacea Linn. : bulb scaly ; scape umbelliferous, 3 9-flowered ; 

 flowers nodding ; leaves ternate ; leafets obcordate, smooth ; styles shorter 

 than the outer stamens. 



Rocky woods. Can. to Geor. W. to Miss, and Texas. May, June. Tj.. 

 Scape 46 inches high. Flowers violet, umbelled, with the petals obovate and 

 sometimes slightly emarginate. Violet Wood Sorrel. 



** Caulescent. 



3. O. corniculata Linn. : pubescent ; stem rooting, decumbent, branched ; 

 peduncles 2-flowered, shorter than the leaves ; leaves ternate ; leafets ob- 

 cordate ; petals obovate, emarginate ; styles as long as the inner stamens. 

 O. corniculata var. Mich. 



Woods. Can. to Car. W. to Miss. May Aug. ^.Stern 610 inches 

 long. Flowers small, yellow. It is distinguished chiefly by its habit ; but the 

 plant of American authors may after all be only a variety of the next. 



Decumbent Wood Sorrel. 



4. O. stricta Linn. : hairy ; stem erect, sometimes procumbent, branched ; 

 peduncles 2 6-flowered, longer than the leaves ; leaves ternate ; leafets 

 obcordate ; petals obovate, entire ; styles as long as the inner stamens. 



Sandy Fields. Can. to Louis. W. to the Rocky Mountains. May Aug. 7].. 

 Stem 4 12 inches high. Flowers small, yellow, 4 6 in an umbel. 



Upright Wood Sorrel. - 



ORDER XXXII. ZANTHOXYLACE^E. ZANTHOXYLS. 



Flowers diclinous, regular. Calyx in 3, 4, or 5 divisions. 

 Petals as many as the sepals, rarely none, convolute. Stamens 

 as many or twice as many as the petals. Ovaries as many as 

 the petals, sometimes fewer; styles more or less combined. 

 Fruit either baccate or membranous, sometimes consisting of 

 several drupes or 2-valved capsules. Seeds solitary or in pairs, 

 with fleshy albumen. Trees or shrubs. Leaves without sti- 

 pules, usually marked with pellucid dots. 



1. ZANTHOXYLUM. Linn. Prickly Ash. 

 (From the Greek J-avBos, yelloiv, and |vXoj/, wood.) 



Polygamo-dicecious. Sepals 3 5, small. Petals longer 

 than the sepals, or none. Stamens and carpels as many as the 

 lobes of the calyx, 1 2-seeded. 



Z. Americanum Mill. : prickly ; leaves pinnate ; leafets in 4 5 pairs, 

 ovate, obsoletely serrate, equal at base ; petioles terete, unarmed ; prickles 

 stipular; flowers in short axillary sessile umbels. Z. fraodneum Wittd. 

 Z. ramiflorum Mick. 



