Family 24. FABACEAE 

 Tribe 6. PSORALEAE 



By Per Axel Rydberg 



Herbs, shrubs, or rarely trees, with glandular-dotted foliage. Leaves odd- 

 pinnately or palmately compound. Flowers perfect, in racemes, spikes, or pan- 

 icles. Calyx usually campanulate, 5-toothed or 5-lobed, the lowest tooth or 

 lobe usually somewhat longer. Corolla more or less papilionaceous, of 5 

 petals, or in Amorpha reduced to the banner and in Parryella wanting; petals 

 when present inserted either on the hypanthium or lower or higher up on the 

 staminal tube; banner usually broad, distinctly clawed, the other petals usu- 

 ally distinctly clawed if inserted on the hypanthium or on the lower part of 

 the staminal tube, but if inserted at the mouth of the latter subsessile and the 

 keel-petals free ; otherwise the keel-petals are more or less adnate to each other 

 along the lower margin of the blade. Stamens 9 or 10, or in Petalostemon 

 and Knhnislera 5, and in a few species of Parosela 7 or 8; filaments monadel- 

 phous or diadelphous, united into a tube split on the upper side, the tenth 

 stamen when present being free or only partly united to the tube below, or 

 in Amorpha and Apoplane sia all free to near the base, and in Parryella appa- 

 rently wholly so. Fruit a 1-few-seeded pod, coriaceous or chartaceous and 

 indehiscent, or more membranaceous and circumscissile or irregularly burst- 

 ing, not valvate. 



Petals distinct from the staminal tube, inserted on the hypanthium. 

 Ovary 1-ovuled and pod 1 -seeded. 



Calyx-lobes not much enlarging in fruit, erect; corolla papilionaceous. 

 Pod indehiscent. 



Plants shrubby, with spinescent-tipped leaflets; leaves odd-pin- 

 nate with a sessile terminal leaflet or 3-foliolate. 1. Psoralea. 

 Plants herbaceous or shrubby, with innocuous leaflets. 



Pericarp adherent to the seed; leaves pinnately 1-3-foliolate; 

 introduced genera. 

 Pod conspicuously glandular-warty, with a short persistent 



beak; leaflets coarsely dentate. 2. CuLLEN. 



Pod not conspicuously warty, with a long flat beak, which 



ultimately breaks off ; leaflets entire. 3. Asphalthium. 



Pericarp not adherent to the seed; indigenous genera. 

 Leaves pinnately 3-foliolate. 



Pod coriaceous or bony, cross- wrinkled, neither hairy 



nor included in the calyx. 4. OrbExilum. 



Pod membranous or leathery, not cross- wrinkled, hairy, 



included in the calyx. 5. Hoita. 



Leaves digitately compound. 



Pod crescent-shaped, flat, cross-ribbed; claw of banner 



twice bent. 6. Rhytidomene. 



Pod orbicular to oblong-ovate, slightly compressed, 

 glandular-dotted but not cross-ribbed; claw of ban- 

 ner straight to the base of the blade. 7. Psoralidium. 

 Pod circumscissile or bursting irregularly; beak long; leaves digitately 

 compound, or the median leaflet petioled, and if 3-foliolate appar- 

 ently pinnate. 8. Pediomelum. 

 Calyx-lobes much enlarging and spreading in fruit, reticulate- veined; 

 corolla scarcely papilionaceous, all petals distinct; shrubs, with odd- 

 pinnate leaves and many leaflets. 9. Apoplanesia. 

 Volume 24, Part 1, 1919] 1 



