LIBRARY 

 NEW YORK 

 BOTAMCAL 



SAftUBN 



Tribe 7. INDIGOFEREAE 

 By Per Axel Rydberg 



Herbs or shrubs, more or less covered with malpighiaceous hairs, i.e., 

 appressed 2-branched hairs, apparently attached at their middle, sometimes 

 with other kinds of pubescence intermixed. Leaves usually odd-pinnate, rarely 

 digitate or unifoliolate. Stipules usually and stipels often present, the latter 

 minute. Flowers usually in axillary racemes or spikes. Calyx 5-toothed. 

 Corolla papilionaceous; keel-petals united above, the claws distinct, the blades 

 furnished with a lateral spur or pouch on the outside. Stamens diadelphous 

 or monadelphous; anthers with the connective produced into a subulate mucro 

 or gland, in some exotic species also variously appendaged. Pod 1-many-seeded, 

 dehiscent, with false transverse partitions between the seeds. Seeds without 

 strophiole. 



1 INDIGOFERA L Sp. PI. 751. 1753. 



Anil [Ludw ] Mill. Gard. Diet. abr. ed. 4. 1754. 

 Hemispodon Kndl. Flora 15=: 385. 1832. 

 F.ilemanthus Hochst. Flora 29: 59.5. 1846. 

 Amecarpus Benth.; Lindl. Veg. Kingd. 554. 1S47. 

 Indigastrum Jaub. & Spach, Illust. PI. Orient, pi. 40_\ 1857. 

 .4«i7a Kuntze, Rev. Gen. 160. 1891. 



Herbs or shrubs. Stipules usually subulate-setaceous, slightly adnate to the petioles. 

 Flowers bracteate, the bracts usually caducous. Calyx small, obliquely 5-toothed, the teeth 

 equal or the lower slightly longer. Corolla pink or red or purple, externally, especially the 

 banner, strigose with malpighiaceous hairs. Banner usually broad, orbicular or obovate, 

 sessile or short-clawed, rounded or obtuse at the apex. Wings oblanceolate or oblong or 

 linear, short-clawed, slightly adherent to the keel, the blade rounded or truncate on the upper 

 side forming a rounded or broadly acute basal auricle which is often thickened. Keel-petals 

 obliquely oblanceolate, gradually tapering into a long broad claw, rounded, obtuse, or acute 

 at the apex, rarely produced into a beak, the lateral spur directed backward or rarely reduced 

 to a small shallow pouch. Stamens diadelphous, the uppermost filament free, the other 9 

 united for about three fourths of their length into a staminal sheath, which is ovate or tri- 

 angular at the apex, the lowest filaments being united further up than the lateral ones. Ovary 

 sessile, one- to many-ovuled, usually strigose; style bent upward and glabrous; stigma capitate. 

 Pod from globose to oblong or linear, terete or somewhat 4-angled or compressed, rarely 

 strongly flattened. Seed from globose to cylindric or prismatic, with truncate ends, attached 

 at their middle. 



Type species, Indigofcra tincloria L- 

 Stem, petioles, and pods hirsute or glandular, not canescent; introduced 

 species.' . ' 

 Plant tall and stout, villous-hirsute; racemes elongate. 1. HlRSUIAE. 



Plant slender, glandular-hirsute; racemes short. II. Viscosae. 



Stem, petioles, and pods more or less strigose, or rarely canescent with 

 short spreading hairs. ■ 

 Plants annual; introduced species. 



Keel produced into a beak; lateral spurs represented by shallow 

 pouches; racemes short, few-flowered, almost subsessile, shorter 



than the flowers. III. ParvifloraE. 



Keel not beaked ; lateral spurs well developed ; racemes longer than 



the leaves, many-flowered. IV. HendECAPHYLI.ae. 



Volume 24, Part 3, 1923J 137 



