338 CAESALPINACEAE 
With simple leaves <P s Go Sh OP oe 
With compound feather-formed leaves. 
Flowers greenish’ .°. . . . » «+» Glemiem 
Flowers, white, showy. . . . . . Gymnocladus 
Herbig se eae A on ge) oe IPG wane eee 
1, CERCIS, L. 
Small tree, with simple, broad leaves heart-shaped at base, and with 
clusters of purple flowers which appear before the leaves. Corolla of 5 
unequal petals, nearly pea-flower shaped. Stamens 10; pod like that of 
the pea with several seeds. 
C. canadensis, L. (Fig. 4, pl. 74.) Rep Bup. AMERICAN JUDAS 
TreEE. Tree, usually 15 to 30 ft. high, but occasionally higher. In early 
spring the purple blooms cover the tree before the leaves expand. South- 
ern part of our area. April. 
2. CASSIA, L. 
Our species herbs with compound leaves, feather-formed with an equal 
number of leaflets on each side of the leaf-stalk, no odd terminal leaflet. 
Flowers yellow. Corolla of 5 petals only slightly pea-blossom-shaped or 
almost regular. Seeds in an elongated pod, numerous. 
1. C. nictitans, L. (Fig. 1, pl. 74.) Sensitive Pea. WILp SENSI- 
TIVE PLant. A low annual, somewhat erect or spreading upon the 
ground, much branching. Stipules long and narrow at base of common 
leaf-stalk. Leaves sensitive. If a few leaflets are touched by the finger 
they and those directly opposite close; if the touch is more rude or if 
repeated, the whole leaf drops at the hinge-like connection with the stem. 
Leaflets about 30, narrow lance-formed. Flowers solitary, or two or three 
together between the leaf-stalks, but considering the plant as a whole, 
flowers numerous, 1/6 to 1/4 in. diameter, Pod linear, an inch or more 
in length. Mostly in dry sandy soil. July-October. 
2. C. Chamaecrista, L. (Fig. 2, pl. 74.) Parrrince Pea. LarcE- 
FLOWERING SENSITIVE PEA. Resembles No. 1, but is larger and flowers are 
an inch to 14 in. broad. Petals spotted with purple; pod linear, 1} to 23 
in. long. Leaves sensitive. Dry sandy soil. July-Sept. 
3. C. marylandica, L. (Fig. 3, pl. 74.) Wrip ok AMERICAN SENNA. 
Herb, 3 to 8 ft. high. Leaflets elliptic, 12 to 20, one or two inches long. 
Flowers generally less than an inch broad, clustering at the base of the 
leaves at the upper part of the plant. Moist places. July-August. 
3. GLEDITSIA, L. 
Large trees with conspicuous thorns, with leaves compound or doubly 
compound, feather-formed, without the odd terminal leaflet. Flowers 
greenish, some perfect, some imperfect, in slender elongated clusters. 
Pod long, straight or twisted, many seeded. 
G. triacanthos, L. (Fig. 6, pl. 74.) Honey Locust. Sweet Lo- 
cust. TuReE-rHoRNED Acacia. A large tree with rough bark and with 
