Nov., 1923I RYDBERG NORTH AMERICAN FABACEAE 497 



The genus is represented by A. grandiftora (L.) Desv. and one or two 

 species closely related to it and perhaps not specifically distinct from it, 

 natives of southern Asia and northern Australia, and by A. tomentosa 

 (H. & A.) Nutt. from the Hawaiian Islands. 



10. Daubentoniopsis Rydb., gen. nov. 



Shrubs, having abruptly pinnate leaves, many entire caducous stipules, 

 caducous bracts and bractlets. The flowers are in axillary racemes. The 

 calyx is rounded campanulate, broader than high, its lobes very short. 

 The corolla is yellow, the banner suborbicular, retuse, reflexed, with a short 

 claw, without callosities; the wings are short-clawed, with obliquely oblong 

 blades, without a distinct basal auricle; the keel-petals are also clawed with 

 a lunate, nearly semicircular blade. The stamens are diadelphous, the 

 staminal sheath dilated at the base. The ovary is stipitate, glabrous, the 

 style arcuate, glabrous; the stigma minute. The pod is coriaceous, stipitate, 

 somewhat compressed, linear, several-seeded, decidedly constricted between 

 the seeds and with spongy transverse partitions. The seeds are oblong- 

 reniform, about twice as long as high. 



Illustration: Plate XXXV /. Daubentoniopsis longifolia (Cav.) 

 Rydb., X 1/2; 1. calyx, X 2; 2. stamens, 3. pistil, 4. banner, 5. wing, 6. 

 keel-petal, X 1 ; 7. pod, 8. cross section of the same, X 2/3. 



The genus is based on Aeschynomene longifolia Cav. Ic. 4: 8. 1797. 

 It is intermediate between Sesban and Daubentonia, having exactly the 

 flowers and seeds of the latter, but the pod is neither 4-angled nor winged. 

 It is constricted around the seeds, but the exocarp is spongy. In Sesban 

 the pod is hardly constricted, the calyx- teeth are more evident, the banner 

 usually has a callosity, and the seeds are different. 



The type of the genus, D. longifolia (Cav.) Rydb., has a rather peculiar 

 history. It was first described by Cavanilles (loc. cit.), and independently 

 by Ortega 1 under the same name. Cavanilles' species was transferred to 

 Piscidia by Willdenow. 2 De Candolle, 3 when he established the genus 

 Daubentonia, included it in that genus, but from the short description given 

 it is evident that he had in mind a yellow-flowered Daubentonia of the 

 southern United States and northern Mexico. In his Prodromus 4 he re- 

 peated his error, and besides described on page 265 a Sesbania longifolia 

 based on Aeschynomene longifolia Ortega. His description fits Cavanilles' 

 plant. When Watson"' merged Daubentonia into Sesbania, he, influenced 

 by De Candolle's misconception, thought himself forced to give the yellow- 

 flowered Daubentonia a new name, S. Cavanillesii S. Wats., as there was 

 already a 5. longifolia (Ort.) DC. Unfortunately, however, he based this 

 name on Aeschynomene longifolia Cav., and technically he gave a new name 



x Ort. Dec. 70. 1797-1800. 

 2 Sp. PI. 3: 920. 1803. 

 » Mem. Leg. 286. 1823. 

 4 Prodr. 2: 267. 1825. 

 6 Bibl. Ind. 258. 1878. 



