NATURAL ORDERS. 
261 
441. Leguminos^, the Pea Trihe. — Herhs^ shrubs^ or trees. 
Leaves alternate, usually compound, stipulate. Sepals 5, more 
or less united. Petals 5, papilionaceous or regular. Stamens 
usually perigynous, distinct, or monadelphous, or diadelphous ; 
a/nthers versatile. Ovary usually a single carpel, 1 or many 
seeded. Fruit a legume. Seeds exalbuminous ; embryo straight, 
or with the radicle bent upon the cotyledons. 
cu Characterized by papilionaceous flowers and leguminous fruit; both, orna- 
mental and useful. 
Genera. — 1. Papilionace^ — Flowers papilionaceous, the vexillum largest, exte- 
rior in Eestivation. Baptisia, Pickeringia, Lupinus, Crotolaria, Ulex, Spartium, Genista, 
Trifolium, Melilotus, Trigonella, Medicago, Indigofera, Psoralea, Amorplia, Dalea, 
Petalostemon, Glycirrliiza, Galega, Tephrosia, Robinia, Sesbania, Colutea, Astraga- 
lus, Oxytropis, Phaca, Cicer, Pisum, Ervum, Vicia, Lathyrus, Astrophia, Orobus, 
Stylosanthes, Arachis, Coronilla, Zornia, ^schynomene, Desmodium, Lespedeza, 
Hedysarum, Amphicarpa, Vexillaria, Glycine, Ery- 
thriua, Strophostyles, Galactia, Dolichos, Apios, Fig. 185. 
Lupinaster, Sophora, Phaseolus Thermia. 2. C/ES- 
ALPiN-rE — the vexillum interior — Gymnncladus, Po- 
maria, Cassia, Tamarindus, Cercis, Gleditschia. 
3. Mimosa — Flowers regular, valvate in aestivation 
— Prosopis, Schrankia, Darlingtonia, Acacia. 
Fig. 185, Baptisia tinctoria (wild indigo); stem 
very branching ; leaves small, bluish-green \ flowers 
email, bright yellow, in loose spikes at the end of 
the branches. 
445. Rosacea, the Pose Tribe. — 
Trees., shrubs., or herbs. Leaves simple 
or compound, alternate, stipulate. Se- 
pals 5 (rarely 3 or 4), more or less 
united, often with as many bracts. Petals as many as the 
sepals, inserted on the edge of a disk lining the tube of the 
calyx. Stamens indefinite, distinct, perigynous. Ovaries soli- 
tary, or several. Seeds destitute of albumen ; embryo straight. 
a. Properties : fruits important, the bark and root astringent. 
Genera. — 1. Chrysobalane^ — Petals and stamens more or less irregular ; fruit 
a drupe ; ovary solitary, cohering witli the calyx on one side only ; style arising 
from the base — Chrysobalanus. 2. Amygdale^— Ovary solitary, free from the 
calyx; style terminal; fruit a drupe — Amygdalus, Prunus Cerasus, Armeniaca. 
8. RosEiE — Ovaries numerous, free from the calyx ; fruit either folHcles or achenia 
— Rosa, Dalibarda, Rubus, Fragaria, Po- 
tentilla, Sibbaldia, Agrimonia, Purshia, 
Geum, Sieversia, Dryas, Spirea, Gillenia, 
Nuttallia, Tigarea, Stylipus, 4. PoMEiE — 
Ovaries 2-5, cohering with each other and 
wiih the fleshy and pulpy calyx tube ; 
fruit a pome — Mespilus, Crataegus, Pyrus, 
Aronia Sorbus. 5. Sanguisorbe^ — Fruit 
a nut inclosed in the indurated tube of the 
calyx ; petals none — Sanguisorba, Pote- 
r?um, Alchemilla, Aphanes. 
Fig. 186, a, flower of Rubus strigosus 
cut vertically ; c, calyx ; pe, petals ; e, sta- 
mens ; d, the disk lining the base of the 
