BOTANY. . 43 
2-ovulatis. Styli tot quot carpella, coaliti, demum inferne distincti. Stigma capitatum, 4—5- 
lobatum. Capsule abortu sepius 2, basi subcoalitae, sessiles, semibivalvia. Semina plerumque 
solitaria subglobosa. Frutex humilis, graveolens, ramosissimus ; foliis oppositis petiolatis, 
palmatim 5—10-foliolatis ; floribus albis in axillis summis solitariis vel subumbellatis. 
A shrub З to 6 feet high, with numerous pubescent, crowded, opposite branches. Leaves 
opposite, (rarely sub-opposite), pubescent, exstipulate ; petioles, 6—10 lines long ; leaflets mostly 
longer than the petioles, marked (as are also the petioles and younger branches) with prominent 
conspicuous glands. In all the specimens from the Rio Grande there are 6 to 10 leaflets, which 
are narrowly linear (scarcely a line wide), and sub-coriaceous ; in those from Sonora there are 5, 
which are twice as broad, and thinner. These glands, on the leaflets, are somewhat distant and 
marginal. Flowers perfect. Pedicels 8—10 lines long, mostly near the extremity of the 
branches, either solitary or 2 to 4, and somewhat umbellate. Sepals 4—5, short and semiovate, 
ciliate on the margin. Petals inserted at the base of the shorter stamens, 3—4 times as long as 
the calyx, obovate, narrowed at the base. Stamens mostly 8; filaments naked, the alternate 
ones longer, compressed ; anthers ovate, fixed by the base, opening longitudinally. Disk 
produced into 8—10, nearly equal glaudular lobes, which are without pores. Ovary hairy, 
4--5-10064, 4—5-celled ; the cells produced above into a short obtuse beak, exterior to the 
style; each cell containing 2 collateral hemitropous ovules. Styles short, at first combined, 
but afterwards (and especially in the unfructified ovaries) distinct below; stigma of 4—5 | 
capitate lobes. Fruit capsular ; only two of the carpels usually ripening ; these are broadly 
ovate, compressed, dotted with brown impressed glands, mucronate with the base of the style ; 
the beak, which in the ovary was at the summit of the carpel, becoming, in the mature fruit, a 
dorsal tooth. At maturity the carpels open nearly the whole length of the dorsal suture, and 
down the back as far as the tooth. The endocarp also separates almost entirely from the epicarp. 
Seeds mostly solitary in each cell, globose-ovate, black and shining. Embryo nearly straight in 
the axis of fleshy albumen ; cotyledons roundish-ovate, flat, with a very short radicle. A very 
distinct genus. 
Prtavia (GASTROSTYLA) DUMOSA, Nutt. in Torr. Ё Gray, Fl. 1, p. 215. San Diego and San 
Pasqual, California, Febr.; Parry, Thurber. A shrub 2 一 3 feet high. Leaves pungent when 
chewed. Cymes 3-flowered, terminal, and on short lateral spurs. Calyx 4-parted ; the segments 
Petals white, equal, oblong, sparsely dotted. Stamens 8; filaments 
ovate, acute, coriaceous. 
Ovary solitary, seated on a fleshy 
subulate ; anthers somewhat reniform, innate, retrorse. 
sub-globose slightly lobed disk. Stigma capitate. *Fruit 1—2-seeded, testa thick and coriaceous. 
Embryo curved, in rather thin fleshy albumen. This plant (as was remarked in the Flora of 
N. America) is hardly a congener of Pitavia. It may form a sub-genus, distinguished by its 
hermaphrodite flowers, solitary ovary, lateral style, and curved embryo. 
: Torr. & Gray, Fl. 1, p. 24. Var. foliis brevioribus 
. ZANTHOXYLUM CAROLINIANUM, Lam. ; 
ovatis, &с.; Gray, Pl. Wright. 1, p. 30. Head waters of the Nueces ; also ravines on Devil's 
river and near Eagle Pass, Texas, March (in flower)—September (in fruit ); Bigelow. 
ZANTHOXYLUM Prerota. H. В. КІЛ. Nov. Gen. & Sp. 6, p. 3. Rocky places and hills near 
Santa Rosa, Cohahuila. February ; Bigelow. Fort McIntosh, on the Rio Grande, May (fruit); 
Schott. 
PrELEA TRIFOLIATA, Linn.; Torr. & Gray, Fl. 1, p. 225, and B. p. 680. Rocky places, Fron- 
