FABACEAE. 91 



lateral ones. Corolla variously colored or white: standard with a broad blade: 

 blades of the wings and the keel-petals auricled on one side, short-clawed. 

 Ovary slender. Lonient few-several-jointed, usually with hooked hairs. — 

 Tick-trefoil. 



Loments constricted into separate joints. 



Loment with the constrictions deeper below than aliove ; joints longer than wide. 

 Stem and branches trailing: blades of the leaflets of an orbicular type. 



1. 1/. arenicola. 

 Stem and branches erect or ascending : blades of the 

 leaflets of an ovate, oval or elliptic type. 

 Loment loug-stipilate : wings and keel-petals very 



unequal in length. 2. M. rhombifolia. 



Loment very short-stipitate : wings and keel-petals 



nearly equal in length. .3. M. obtuisu. 



Loment with equally deep constrictions on both sides ; joints 



suborbicular. 4. M. purpurea. 



Loments straight on the upper side, undulate on the lower. 5. M.supinu. 



1. M. arenicola Vail. Stems prostrate: stipules subulate: leaflets 1-5; blades 

 ovate-orbicular, 1-2.5 cm. long: lateral calyx-lobes ovate: standard mostly less 

 than 4.5 mm. long: loment about evenly constricted beneath and above, the 

 joints orbicular or oval, 2-2.5 mm. wide. — Pinelands, 



2. M. rhombifolia (Ell.) Vail. Stems pubescent: stipules subulate: leaflets 

 5-9 cm. long; blades ovate to ovate-lanceolate, pubescent beneath: lateral 

 calyx-lobes lanceolate, the lower lobe scarcely longer: standard 5-7 mm. long: 

 keel-petals mostly shorter than the standard: loment-joints 3.5-4 mm. wide, 

 the ventral side abruptly rounded. — Pinelands. 



3. M. obtusa (Muhl.) Vail. Stems hirsute or minutely pubescent: leaflets 

 1-2 cm. long; blades orbicular-ovate or oval, sparingly pubescent beneath: 

 lateral calyx-lobes deltoid, acute; the lower lobe lanceolate: standard 4-5 mm. 

 long: stipe of the loment i as long as the joint. — Pinelands — F. K. 



4. M. purpurea (Mill.) Vail. Stems pubescent: stipules ovate: leaflets 2-11 

 cm. long; blades ovate, ovate-oblong, or elliptic, pubescent, and often reticu- 

 late beneath: lateral calyx-lobes linear-lanceolate: standard 3.5-4 mm. long, 

 cuneate at the base: keel-petals obliquely pointed: loment-joints suborbicular, 

 over 2.5 mm. wide. — Pinelands. — (Cuba, Ant.) 



5. M. supina (Sw.) Britton. Stems glabrous or nearly so: stipules lanceolate 

 or ovate-lanceolate: leaflets 2-8 cm. long; blades oval or elliptic: lateral calyx- 

 lobes lanceolate : standard 5-6 mm. long, truncate or subcordate above the 

 short claw: keel-petals rounded at the apex: loment-joints half-orbicular, 1-1.5 

 mm. wide. — Hammocks. — (Bah,, Cuba, Ant.) 



16. DOLICHOLUS Medic. Herbs or vines. Leaflets 3 or 1. Flowers 

 perfect and complete. Calyx 2-lipped, the 2 upper lobes more or less united. 

 Corolla yellow : blade of the standard broadened upward : blades of the wings 

 unequally auricled on both sides, the auricles angular: blades of the keel- 

 petals much longer than wide. Pod flat, short. 



Corolla much longer than the calyx. 



Racemes very slender, many-flowered, exceeding the leaves : flowers and legumes 



reflexed. 1. D. minimus. 



Racmes 1-6 flowered, as long as the leaves or shorter. :!. U. pariiflorus. 



Corolla about as long as the calyx or shorter. 

 Plants with prostrate or climbing stems. 



Leaves mostly 1-foliolate: ovary and pod long-hairy: 



calyx-lobes long-clliate. ^. D. ilirhauxii. 



Leaves 3-foliolate : ovary and pod short-hairy : calyx- 

 lobes short-ciliate. 4. D. cinereus. 

 Plants with erect stems. 



Upper leaves 1-foliolate : standard-blades of a subor- 

 bicular type : style much longer than the ovary. 5. D. simplicif alius. 

 Upper leaves 3-foliolate : standard-blade of an obovate 



type: style about as long as the ovarj 6. D. intermedius. 



