NORTH AMERICAN FLORA 



[Volume 25 



Follicles with a distinctly stipe-like base 3-9 mm. 

 long. 33 



Seeds 4-5 mm. long, 3.5-5 mm. broad ; follicles 4.5-8 

 mm. long, 4-6 mm. broad, the base stipe-like, the 

 body reniform, obliquely-orbicular or obliquely- 

 obovoid ; leaflets usually abruptly short-pointed. 34 

 Branches of the inflorescence not corky-thickened ; 

 plant pilose. 35 



Sepals oblong to ovate, or broadly triangular, not strongly 

 imbricate in flower ; carpels 1-5. 

 Calyx 5-lobed or parted, persistent beneath the follicles. 

 Young growth, branches of the inflorescence and 

 often the petioles and under surfaces of the leaf- 

 lets pubescent or puberulent with simple hairs, 

 or glabrous ; gynoeeium 1-5-carpellary. 

 Follicles connate below or to the middle. 



Leaflets 5-15, sessile or subsessile, 1.5-4.3 cm. 

 broad ; pubescence spreading ; inflorescence 

 terminal. 36 



Leaflets 6 or 8, petioluled, 4.5-6 cm. broad ; 

 pubescence appressed; inflorescence lateral. 37 

 Follicles distinct. 



Follicles sessile or subsessile. 



Valves of the follicles 6-8 mm. long, 5.5-6 

 mm. broad ; pedicels stout ; seeds 5-6 

 mm. long, 4-4.5 mm. broad; leaflets 9-14 

 cm. long, 3-6.5 cm. broad. 

 Valves of the follicles 4.5-5.5 mm. long, 3-4 

 mm. broad ; pedicels slender; seeds 3.5- 

 4.5 mm. long, 2.5-3.5 mm. broad ; leaflets 

 5-7.5 cm. long, 2.5-4 cm. broad. 39 



Follicles long-stalked, the stipe 4-4.5 mm. 

 long. 40 



Young growth, branches of the inflorescence and 

 often the petioles and under surface of the 

 leaflets pubescent or puberulent with radiating 

 or stellate hairs ; gynoeeium 1-3-carpellary. 

 Leaflets mostly conduplicate, the largest one 2.7 



cm. long, emarginate. 41. 



Leaflets flat, acute or obtuse but rarely emargi- 

 nate, usually more than 3 cm. long. 

 Leaflets not velvety-pubescent beneath. 



Midvein strongly impressed above ; petals 

 1.5-2 mm. long, 0.7-1 mm. broad ; follicle 

 sessile, subglobose. 

 Midvein prominent or at least not im- 

 pressed above ; petals 2.5-3.8 mm. long 

 1-1.7 mm. broad ; follicle short-stipitate 

 obovoid. 



Leaflets velvety stellate-pubescent beneath. 44. 

 Calyx of 5 free sepals, deciduous. 



Leaves 2-3 cm. long ; lateral leaflets of an obovate 



type, 5-10 mm. long, 3-5 mm. broad. 45. 



Leaves 3-30 cm. long; leaflets oblong-lanceolate to 

 ovate, usually decidedly larger, 1-8.5 cm. long, 

 0.5-4 cm. broad. 

 Leaves glabrous or with few scattered hairs 



beneath ; follicles glabrous. 46. 



Leaves velvety beneath ; follicles pilose. 47. 



Z. Elephantiasis. 



Z. caribaeum. 

 Z. bijugum. 



Z . martinict nse. 

 Z. Kellermanii. 



38. Z. Goldmani. 



Z. arborescens. 

 Z. melanoslictum. 



Z. duplicipunciatum. 



42. Z. microcarpum. 



43. 



Z.flavum. 



Z. pistacifoliwm. 



Z. Purpusii.* 



Z. Clara- fit rculis. 

 Z. mollissimum.* 



1. Zanthoxylum americanum Mill. Gard. Diet. ed. 8. 1768. 



Zanlhoxylum fraxinifolium Marsh. Arbust. 167. 1785. 

 Zanthoxylum fraxineum Willd. Berl. Baumz. 413. 1796. 

 Zanthoxylum ramiflorum Michx. Fl. Bor. Am. 2: 235. 1803. 

 Zanlhoxylum mite Willd. Enum. 1013. 1809. 

 Thy lax fraxineum Raf. Med. Bot. 2: 114. 1830. 

 Mioptrila odorata Raf. Am. Man. Mulb. 37. 1839. 



An aromatic shrub, or sometimes a small tree, with a grayish or brownish bark and 

 spreading branches which are armed with sharp, straight or sometimes curved brownish or 

 blackish rather stout stipular prickles ; petioles terete or nearly so, slightly channeled 

 above and on the rachis, more or less pubescent, commonly armed with a few slender pale 

 prickles; leaves odd-pinnate, 1-3 dm. long; leaflets 3-11, ovate to oblong-ovate or oval, 

 1.5-8 cm. long, 0.7-3. 8cm. broad, acute, short-acuminate, obtuse, or occasionally emarginate 

 at the apex, obliquely rounded or cuneate at the base, crenate or entire, deep-green above, 



* These species are repeated in the key because the number of the sepals is doubtful. 



