Nov., 1923] RYDBERG NORTH AMERICAN FABACEAE 489 



The subtribe contains, besides the following three genera, a few confined 

 to the Old World. Cracca is cosmopolitan of warmer regions, Peteria is 

 endemic American, and Galega is Eurasian, introduced in the New World. 



Stipules not spinescent; lateral veins of the leaflets prominent. 



Upper filaments wholly united with the staminal sheath, forming a closed 

 tube; banner in ours glabrous. 1. Galega. 



Upper filament free, at least at the base; banner strigose on the back. 2. Cracca. 



Stipules spinescent; upper filament free; lateral veins of the leaflets obsolete. 3. Peteria. 



i. Galega [Tourn.] L. Sp. PI. 714. 1753 



Perennial herbs. The leaves are odd-pinnate, with semi-sagittate 

 stipules. The flowers are in axillary or terminal racemes with narrow bracts 

 and no bracteoles. The calyx has 5 subequal lobes. The corolla is white 

 or light blue; the banner is obovate-oblong, narrowed below into a very 

 short claw; the wings have an oblong blade with a prominent basal auricle, 

 and a longer claw, and are adherent to the keel at the middle; the keel- 

 petals are obtuse, more or less arcuate, longer than the wings, and united 

 nearly their whole length. The filaments are monodelphous, i.e., all united 

 into a sheath. The ovary is sessile, many-ovuled; the style glabrous; the 

 stigma small, terminal. The pod is linear, terete, 2-valved, sometimes 

 constricted between the seeds. Seeds are transversely oblong, without 

 strophiole. 



Illustration: Plate XXXIII A. Galega officinalis L., X 2/3; 1. calyx, 

 2. banner, 3. wing, 4. keel-petal, 5. staminal sheath, 6. pistil, X 2; 7. pod, 

 X 1 ; 8. cross section of pod, 9. seed, X 2. 



In the Species Plantarum, the genus Galega contained only one species, 

 Galega officinalis L., which therefore is the type. 



Synonyms : 



Callotropis G. Don. Gen. Syst. 2: 228. 1832. Type: C. tricolor (Hook.) 

 G. Don., based on Galega tricolor Hook., which is supposed to be the 

 same as G. officinalis L. 



Accorombona Endl. Gen. 1427. 1841. This was a substitute for Callo- 

 tropis G. Don., not Calotropis R. Br. 1809. Hence the same type. 



The genus consists of 4 or 5 species native of southern Europe and the 

 Orient. Of these, G. officinalis is sometimes cultivated as a forage plant 

 and in olden times was used in medicine. It has been found occasionally 

 in the western states from Kansas to Utah, as an escape from cultivation 

 or introduced incidentally among seeds. The genus is closely related to 

 Cracca, differing mainly in the monadelphous stamens. The racemes are 

 mostly axillary, and therefore the genus is, according to Bentham and 

 Hooker, anomalous in their subtribe Tephrosieae, but, as will be shown, 

 this abnormality is found even in species of Cracca. 



2. Cracca L. Sp. PI. 752. 1753 



Herbs, often woody below, or shrubs. The leaves are odd-pinnate, the 

 leaflets striate, with veins oblique to the midrib and parallel; the stipules 



