214 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 



KEY TO THE RPEPrES. 



Stipules not peltate; stipules and Lmcteolots ovate or oblong; 

 wings a little longer than tlie standard; npper tooth of the calyx 

 short, broad, trmicate, emarginate. {Section Euphaseolus.) 

 Calyx teeth all shorter than the tube. 



Legume Hat, broad, falcate, 2 or 3-seeded. I, P. hmatus 



Legume linear, many-seeded, straight or slightly arcuate. 

 Bracteoles broad, equal to the calyx; peduncleshorter 

 than the petiole. 



Bracte(»les narrow, shorter than the calyx, pedTuicle 

 usually longer than the petiole. 



2. r. vulgaris. 



Keel spirally twisted (3 or -1 times), 8. J\ caracalla. 



Keel slightly twisted. 4, 1\ antillaniis. 



5. r. adenanthus. 



The lowest calyx teeth narrow, subecpial to or longer than the 

 tube. 



Stipules often more or less peltate below the insertion; upper tooth 

 of the calyx short, broad, truncate or emarginate; wings subetiual 

 to the standard. (Section Stropuostylks.) H. /*. ovatnf;. 



Stipules not peltate; calyx sul>tubu]ar, with 5 acute teeth; wings 

 long-clawed, longer than the standard; legume narrow, reflexed. 

 (Section Macroi'Tu.u m.) 



7. J\ laihyroidrs. 



1. Phaseolus lunatus L. 



(TTrban, 308.) 



Stems biennial, u^^ually twining; leaflets 3, the central one ovate-delU.id, 7 to 10 cm. 

 long, 5 to 7 cm. broad, the lateral ones very unequal-sided; flowers in copious long or 

 short stalked axillary racemes 2.5 to 10 cm. long; calyx 2.2 to 3 mm, deep; corolla 

 under 1.5 cm. deep; Ptandard dull green, wings and keel pale l>lue or in the cultivated 

 plant white; pod 5 to 7.5 cm. long, 1.25 to 1.17 cm. wide, glabrous, the upper suture 

 sliglitly and the lower nuich recurved, dark violet, margins green; seeds juirple or 

 white. 



S2>ontaneous and cultivated, near Coamo, in thickets at Farajones and in woods at 

 Tedro Garcia; near Cabo Ilojo, on hedges at Buena Vista; near Riucon, in thickets at 

 Puntas; near Aguadilla in gardens at Espinel.— Cuba, Jamaica (Grisebac^h), Haiti, St. 

 Thomas (Eggers), St. Croix (do.), St. John (do.), Antigua (Grisebach), Guadeloupe, 

 Dominica, Martinique, St. Vincent, Barbados, Trinidad (Kuntze), Margarita. Trop- 

 ical America. Widely dispersed through the tropics of both hemispheres. 



P. lunatus is easily distinguished from P. vulgaris ])y its racemose inflorescence and 

 its smaller flowers, pods, and bracts. 



This plant is cultivated in Africa for the same purpose as P. vnhjarh with us. 

 Local name, hnhns. Lima bean. 



2. Phaseolus vulgaris L. 



(Urban, SOS.) 



Stem annual, wide-climbing; leaflets 3, the central one broad-ovate, 10 Uy 12.5 cm. 

 long, acute; peduncles in pairs, 2.5 to 5 cm. long, 2 or S-flowered; pedicels ^.5 to 8.5 



mm. long; calyx 0.0 mm. deep; corolla white or lilac, 2.5 cm. long; pod 10 to 12.5 cm. 

 long, 1.2 cm. wide. 



Cultivated near Adjuntas at Jnnco and near Mayaguez. 7*. vulgnrh is a commonly 

 cultivated species, not clearly known anywhere in a native state. 



The home of the connnon bean, P. vulgaris, as W ittmack has shown, is South Amer- 

 ica, where nearly related species are also cultivated. Of this species there are innu- 

 merable varieties. The green pods are used as a vegetable in the form of ^\strin^'' or 



