PiTAvrA. ZANTHOXYLACE/E. 215 



the sepals, spreading. Stamens alternate with and longer than the petals : 

 filaments thickened helow and hairy on the inside ; in the fertile flowers very 

 short and with sterile anthers. Ovary of 2 united carpels, placed on a 

 convex torus: ovules 2 in each carpel, situated one above the other: styles 

 short, united, or none: stigmas 2. Fruit a 2-cclled samara, turgid in the 

 centre, the margin expanded into a broad orbicular membranaceous -and reti- 

 culated wing. Seeds oblong, solitary in each cell. — Shrubs. Leaves pin- 

 nately 3-( rarely 5-) foliolate, Avith pellucid dots, the lateral leaflets inequila- 

 teral. Flowers whitish, cymose : cymes corymbed or panicled. 



~h^- P. trifoUata (Linn.) : leaflets sessile, ovate, mostly acuminate, the 

 terminal one cuneiform and attenuate at the base; flowers commonlv tetran- 

 drous; style short.— IfV///. C<tr. p. H9,; Mich.r. ! fi. Lp. 99; Ell.'sk. 1. p. 

 21 1 ; Ton: ! ft. 1. p. 189 ; DC. nrodr. 2. p. 82. 



In shady rocky places, from Lake Erie ! to Florida ! west to Kentucky ! and 

 Texas! June. — Pubescent when young, 6-8 feet high. Leaflets obscurely 

 crenulate. Ovary of the staminalc flowers abortive. Odor of the flowers 

 disagreeable. — P. monophylla, Law. diet, appears not to belong to the genus, 

 and is perhaps a Rumex, as is suggested by Ad. Jussieu. 



2. P. Baldwinii : leaves very small, glabrous; leaflets sessile, oval, ob- 

 tuse, the terminal one cuneiform at the base; flowers tetrandrous; styles 

 none. 



St. John's, East Florida, Baldwin! (in herb Acad. Philad.) — Shrub 

 apparently not more than a foot high, with numerous short scraggy 

 branches. Leaflets scarcely an inch in length. Flowers smaller than in 

 P. trifolia. Fruit not seen. 



3. PITAVIA. Molin. Chil. 

 Galvezia, Ruiz, if- Pav. ; Ad. Jiiss.; not of Domb. in Juss. gen. 



Flowers by abortion diclinous. Calyx 4-parted. Petals 4, longer than 

 the calyx. Sterile Fl. Stamens 8; the 4 opposite the petals shorter: 

 filaments subulate, glabrous, inserted around the base of the oblong gynophore 

 which supports 3-4 distinct abortive ovaries ; the styles coherent with each 

 other above. Fertile Fl. Ovaries 4, on a 4-angled fleshy gynophore, each 

 with 2 collateral ovules : styles rising from the apex of the ovaries, distinct 

 at the base, coalescent above: stigmas connate into a single 4-lobed one. 

 Drupes 4, or by abortion fewer, 1-seeded. Seed ovoid, with a straight em- 

 bryo. Ad. Juss. sub Galvezia. 



1. P. dumosa (Nutt. ! mss.) 



St. Diego, California, Nuttall ! — A low branching shrub. Leaves oppo- 

 site or fascicled on short branches ; linear, attenuate at the base, obtuse, 

 about an inch long, rather thick, 1-nerved, marked with glandular pellucid 

 dots ; the margin with a row of glandular dots, but entire. Flowers, in the 

 specimens, all perfect, nearly solitary at the extremity of the branches, small, 

 on short peduncles. Petals somewhat unequal. Stamens 8, the alternate 

 ones smallest; or in some flowers only 4. Ovary solitary, simple, subglo- 

 bo5e, placed on a minute flat 8-toothed disk, 1-celled, with 2 collateral 

 ovules: style lateral (arising from about the middle of the ovary) : stigma a 

 little thickened, somewhat grooved. Fruit a single globose 1-seeded drupa- 

 ceous nut (?), about the size of a pea. Seed globose, with a somewhat crus- 

 taceous testa. — We have failed, by some accident, to receive Mr. Nuttall's 



