Genus 47. 



PEA FAMILY. 



421 



47. DOLICHOLUS Medic, \orles. Chur. Phys. Gesell. 2: 354. 1787. 



[Rhvnchosia Lour. Fl. Cochin. 562. 1793.] 



Perennial twining, trailing or erect herbs, with pinnately 1-3-foIiolate leaves, and yellow 

 mostly axillary and racemose flowers. Leaflets generally punctate with resinous dots, not 

 stipellate. Calyx 4-5-lobed, somewhat 2-lipped. Standard obovate or orbicular, spreading 

 or reflexed. Wings narrow. Keel incurved at the apex or falcate. Stamens diadelphous 

 (gandij. Ovary nearly sessile; ovules 2, rarely i ; style filiform. Pod flat, oblong or obliquely 

 orbicular, 2-vaIved, 1-2-seeded. [Name diminutive of Dolichos.] 



.\bout 200 species, natives of warm and temperate regions. In addition to the following, some 

 12 others occur in the southern States. Type species: Dolicholus minimus (,L.) Medic. 



Leaflets 3. 



Stem twining or trailing. 



Racemes shorter than the leaves; flowers 3"-^" long. i. D. lomentosus. 



Racemes longer than the leaves ; flowers about 6" long. 2. D. latifoliiis. 



Stem erect, i-2^ high. 3. D. cicctns. 



Leaflets solitary , very liroad ; plants low, i'-<)' high. 4. D. simplicifoUus. 



I. Dolicholus tomentosus (L. ) Vail. Twin- 

 ing Dulicholus. Fig. 2642. 



Glycine tomcntosii L. Sp. PI. 754. 1753. 



Rhynchosia tomcniosa var. volubilis T. & G. Fl. N. A. 

 1:285. 1838. 



Rhynchosia tomcniosa H. & A. Comp. Bot. Mag. I : 

 23 1835- 



D. lomentosus Vail, Bull. Torr. Cluli 26: 112. 1899. 



Trailing or twining, more or less pubescent with 

 spreading hairs, simple or branched, l-3 long. 

 Stipules ovate, acute, 2"-4" long, sometimes want- 

 ing ; petioles shorter than the leaves ; leaflets 3, or 

 the lowest leaves i-foliolate, ovate, orbicular or 

 broader than long, obtuse but generally pointed, 

 i'-2' long; racemes short-peduncled or sessile, 

 2-8-flowered ; flowers 3"-4" long ; calyx deeply 

 4-parted, the upper lobe 2-clef t ; pod oblong, acute, 

 pubescent, 8"-9" long, about 3" wide. 



In dry sandy soil. Virginia" to Florida, west to 

 Texas. May-July. 



2. Dolicholus latifolius ( Xiitt. ) Vail. 

 Prairie Rh3'nchosia. Fig. 2643. 



Rhynchosia latifolia Nutt. ; T. & G. Fl. N. A i . 285. 

 1838. 



Dolicholus latifolius Vail. Bull. Torr. Club 26: 114. 

 1899. 



Softly pubescent, stem angled, trailing or climb- 

 ing, sometimes 5 long, with a few long branches. 

 Stipules lanceolate, small, or wanting; petioles 

 I'-T,' long ; leaflets 3, broadly ovate, or somewhat 

 rhomboid, or the end one orbicular, i'-3' long, 

 mostly obtuse ; racemes elongated, exceeding the 

 leaves, sometimes 1 long in fruit, many-flowered ; 

 pedicels i"-2" long; calyx about 6" long, very 

 deeply parted, the segments narrowly lanceolate, 

 acuminate; corolla little longer than the calyx; 

 pod oblong, acute, very pubescent, about l' long. 



In dry soil. Missouri to Louisiana and Texps. May- 

 June 



