RUTACEAE 673 
1. Malpighia glabra L. A glabrous shrub 2-12 dm. tall, with slender branches. 
Leaf-blades thinnish, ovate, 2-5 cm. long, acute or acuminate, nearly sessile: peduncles 
0.5-1 em. long, axillary : pedicels several, umbellately disposed, often longer than the 
peduncles, slender-clavate : sepals ovate, or oblong-ovate: petals rose-red, or sometimes 
rather pale pink ; blades about as broad as long, 4-6 mm. long, erose or fimbriate: drupe 
about 1 cm. in diameter, red, the nutlets 4-angled, transversely wrinkled between the 
crests or ridges. 
In sandy soil, southern Texas and Mexico. Also in the West Indies, Spring and summer. 
3. THRYALLIS L. 
Shrubby plants, sometimes herbaceous above the base. Leaves opposite: blades with 
2 glands at the base or on the upper part of the petiole. Flowers regular, in terminal 
racemes. Sepals 5, without glands. Petals 5, yellow or orange: blades finely toothed, 
distinctly clawed. Stamens 10, all perfect : filaments distinct or nearlyso. Ovary 3-celled : 
styles 3, distinct: stigmas very small. Capsule 3-celled, the carpels separating and debis- 
cent. Embryo hooked. 
1. Thryallis angustifdlia (Benth.) Kuntze. Somewhat woody at the base. Stems 
usually tufted, slender, 3-7 dm. tall, glabrate, or strigose with medifixed hairs: leaf- 
blades various, linear to lanceolate, with acute ends, or the lower oblong to oval, with ob- 
tuse ends and short-petioles, all glabrous or nearly so, glaucous: racemes virgate, loosely 
flowered : sepals lanceolate : petals yellow turning reddish ; blades oblong-ovate, 2-4 mm. 
long, with a dark midrib: capsules 3-4 mm. long. 
In dry, usually rocky soil, Texas and adjacent Mexico and in Lower California. Summer. 
4. ASPICARPA L. C. Rich. 
Perennial herbs, more or less woody at the base, commonly diffuse in habit, sometimes 
almost twining vines. Leaves opposite : blades entire. Flowers solitary or clustered, dimor- 
phous, the normal with 5 sepals, 8-20 glands, and petals with fringed blades ; stamens 5-6, 
2-3 sometimes imperfect ; filaments monadelphous: gynoecium of 3 distinct or partially 
united carpels ; styles united ; stigma depressed-capitate or truncate. Cleistogamous flowers 
more fertile than the normal, with glandless sepals and usually a dicarpellary pistil with little 
or no style, usually maturing one carpel into a triangular nutlet incumbent on the receptacle. 
1. Aspicarpa hyssopifdlia A. Gray. Woody at the base. Stems erect, 1-3 dm. 
tall, more or less pubescent with medifixed hairs: lower leaves with oblong or oval 
blades, the upper with linear or linear-lanceolate blades 1-3 cm. long, sessile or nearly so, 
and partly clasping, all glabrous: flowers solitary in the axils of the leaves, the normal 
with pedicels nearly as long as the leaves: petals 4~6 mm. long ; blades fimbriate : cleis- 
togamous flowers sessile : nutlets 4-5 mm. long, reticulated, with an acute crest on the back. 
On plains and prairies, southern Texas and adjacent Mexico. 
FAMILY 8. RUTACEAE Juss. RuE FAMILY. 
_Aromatic shrubs or trees, or rarely shrubby herbs, often armed with prickles 
which are sometimes raised on corky ridges. Leaves alternate or opposite : 
blades simple or pinnately compound: leaflets glandular-punctate, the lateral 
With inequilateral blades. Flowers usually perfect, in paniculate or corymbose 
cymes, mostly regular. Calyx of 3-5, or rarely more, imbricated sepals, more 
or less united at the base, or wanting. Corolla of 3-5, or rarely more, usually 
imbricated petals. Androecium of as many stamens as there are petals, or 
rarely thrice as many, inserted on a hypogynous disk, those opposite the petals 
usually shorter than the others. Filaments distinct or united below. Anthers 
introrse. Gynoecium of 2-5 distinct or united carpels. Styles more or less 
united. Stigma often 3-5-angled. Ovules 2, or rarely 4 or more, superposed in 
each cavity. Fruit capsular, or often a samara, drupe, or berry. Seeds solitary 
or several, with an often crustaceous furrowed or punctate testa. Endosperm 
fleshy or wanting. 
A. 
a. Fruit ebaerd ot samaeold. 
7 2 3 or more in each cavity : capsule lobed, solitary. 
ynoecium 4-5-carpellary : leaf-blades divided. 1, Ruta. 
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