52 
+ + + Leaves palmately 3-foliolate, with subsessile more or less obliquely obcordate-cuneate 
leaflets, and with short adnate stipules or none. 
3. O. Wrightii Gray. Perennial from a stout conical subterranean caudex, at 
the apex of which the decumbent leafy branches are clustered ; otherwise very simi- 
lar to the next species.—In the mountains west of the Pecos. 
4. O. corniculata L. Annual or perennial, erect or procumbent, gray or rusty 
strigose-pubescent, with slender stems not from a caudex: the 3 leaflets broader than 
long, obcordate, with round or truncate ciliate stipules: flowers 5 to 8 mm. long 
(sometimes longer), solitary or paired on 2-bracted peduncles equaling or exceeding 
the leaves: sepals oblong, rather obtuse: petals obscurely crenulate or emarginate, 
about twice as long as the calyx: styles about equaling the long stamens: pod erect, 
oblong, strigose, 10 to 20 mm. long: seeds ovate, acute, much flattened, with 1 to 3 
deep marginal grooves and numerous transverse ridges.—Throughout Texas, as well 
as the entire country. A cosmopolitan and exceedingly variable plant. Var. (?) 
MACRANTHA Treleasa is decumbent from a stout or slender horizontal rootstock, the 
branches erect, pilose with spreading pointed hairs: leatlets narrower: flowers pale, 
10 to 15 mm. long, extremely variable in relative length of stamens.—Eastern and 
southern Texas. Var. STRICTA Say. is an erect annual (sometimes perennial), sub- 
glabrous to villous: leaves without stipules: inflorescence a dichotomous cyme or 
umbellate: flowers about 8 mm. long: petals nearly entire. (0. stricta L. of most 
authors. )—With the type, but flowering later. 
** dcaulescent: leaves and scapes from a scaly bud: flowers rose-violet : leaves palmately 
3-foliolate. 
5. O. violacea L. Leaflets about 10 mm. long, broadly obcordate with an open 
sinus, the midrib tipped on the lower side with a pair of usually prominent confluent 
callosities: scapes several, longer than the leaves, umbellately 3 to 12-flowered: 
sepals ovate, obtuse, with 2 more or less confluent orange callosities on the outer side 
at tip: petals thrice as long as calyx: pod round-ovoid, about 5 mm. long, glabrous: 
seeds compressed ovoid, irregularly rugose-tuberculate.—A common species of the 
Atlantic States, only reported as yet west of the Pecos in Texas. 
6. O. vespertilionis Torr. & Gray. Leaves few, the leaflets open V-shaped, more 
or less conspicuously calloused in the sinus, the linear blunt lobes 10 to 25 mm. long, 
usually 5 mm. or less wide: scape mostly solitary, longer than the leaves, umbellately 
about 6-flowered: sepals with 4 to 6 narrow callosities: pod ovoid-oblong, 10 mm. 
long, somewhat pubescent: seeds compressed, round-ovoid, longitudinally 8 to 10- 
creased and transversely wrinkled. (O. Drummondii Gray.)—Between the Colorado 
and the Rio Grande and west to New Mexico. 
RUTACER. (RvE FAMILy.) 
Trees, shrubs, or herbs, with pellucid or glandular-dotted aromatic 
opposite or alternate leaves, generally regular and symmetrical flowers, 
4 or 5 sepals and petals, as many or twice as many stamens inserted 
outside of an hypogynous disk, and the 2 to 5 carpels separate or com- 
bined into a compound ovary of as many cells and raised on a prolonga- 
tion of the receptacle (gynophore) or disk.—Here belong oranges, citrons, 
lemons, etc. 
* Ovary deeply 2 to 5-lobed or even quite distinct. 
4 Herbs or shrubby only at base: leaves alternate. 
1. Peganum. Herbs: leaves many-parted: fruit a globose 3-lobed nearly sessile 
pod: stamens 12 to 15. 
2, Thamnosma. Shrubby at base: leaves simple and entire: fruit a 2-lobed coria- 
ceous short-stipitate pod: stamens 8. 
