400 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DOUBTFUL SPECIES. 



Inga cokiacea Dou, Hist. Dichl. PI. 2: 390. 1832. Described from somewhere 

 in Mexico. 



Inga flexuosa Schleclit. Linnaea 12: 559. 1838. /. schiedeana Steud. Nom. 

 Bot. ed. 2. 1 : 810. 1840. Based upon leaf specimens from Jalapa ; perhaps the 

 same as /. xalapensis Benth. 



66. CAESALPINIACEAE. Senna Family. 



Trees or shrubs, often armed with spines : leaves simple, pinnate, or bipiu- 

 nate; flowers usually large and showy, mostly racemose, regular or irregular; 

 petals usually 5; stamens commonly 10; fruit a legume but very variable in 

 form. 

 Leaves pinnate, bifoliolate, or simple, never bipinnate. 



Anthers erect. Leaves pinnate 1. CASSIA. 



Anthers versatile. 



Leaves with numerous leaflets. 



Calyx lobes 4; fruit thick 2. TAMARINDUS. 



Calyx lobes 5; fruit very flat and thin 3. POEPPIGIA. 



Leaves simple or of 2 leaflets. 



Petals very unequal ; fruit winged on the upper suture ; leaves simple. 



4. CERCIS. 

 Petals subequal ; fruit not winged ; leaves simple or bifoliolate. 

 Flow^ers 7 mm. long or shorter. Fruit indehiscent ; leaves bifoliolate. 



5. CYNOMETRA. 

 Flowers more than 1 cm, long. 

 Calyx lobes 4 ; fruit indehiscent. Leaves bifoliolate. 



6. HYMENAEA. 



Calyx lobes 5; fruit dehiscent 7. BAUHINIA. 



Leaves bipinnate, at least some of them. 



Calyx lobes strongly imbricate; seeds without endosperm. 



Leaves partly pinnate. Trees or large shrubs 8. HAEMATOXYLUM. 



Leaves all bipinnate. 

 Plants low shrubs, chiefly herbaceous, unarmed ; fruit thin, elastically 



bivalvate 9. HOFFMANSEGGLA. 



Plants large shrubs or trees, often spiny ; fruit thin and bivalvate or 



often very thick 10. CAESALPINIA. 



Calyx lobes valvate or slightly imbricate ; seeds with endosperm. 

 Plants unarmed. 



Flowers red; fruit very broad, thick, and hard 11. DELONIX. 



Flowers yellow; fruit narrow, thin 12. CONZATTIA. 



Plants armed with spines. Fruit narrow, thin. 



Fruit linear, constricted between the seeds; rachis of the leaf spiuose. 



13. PABKINSONIA. 

 Fruit linear-oblong, not constricted ; rachis of the leaf not spiuose. 



14. CERCIDIUM. 

 1. CASSIA L. Sp. PI. 376. 1753. 

 Reference: Bentham, Trans. Linn. Soc. Bot. 21: 503-591. pi. 60-63. 1871. 

 Unarmed trees or shrubs ; leaves pinnate, the leaflets large or small ; flowers 

 usually yellow, commonly large and showy, racemose, paniculate, or solitary ; 

 fruit very variable in form, dehiscent or indehiscent. 



Besides the species enumerated here, a large number of herbaceous ones also 

 occur in Mexico. 



