WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 613 



KEY TO THE GENERA. 



Ovary 2 or 3-celleci; ovules solitary or few in the cell. 

 Plants perennial; fruit ovoid or globose, with 1 to 4 

 seeds in each cell; seeds turgid, rounded at 



both ends, smooth 1. Marah (p. 613). 



Plants annual; fruit oblong, attenuate at each end; 

 with 2 to 6 seeds in each cell; seeds small, 



flattened, rugose 2. Echinopepon (p. 613). 



Ovary 1-celled; ovules solitary or numerous. 



Ovules solitary, pendulous; fruit dry 3. Sicyos (p. 614). 



Ovules numerous, borne on 3 to 5 placentae, mostly 

 horizontal; fruit various. 

 Anthers straight or merely curved; slender or 

 coarse vines. 

 Slender climbing vine; flowers dioecious; 



fruit a berry 4. Ibervillea (p. 614). 



Coarse prostrate vine; flowers monoecious; 



fruit a leathery pepo 5. Apodanthera (p. 615). 



Anthers much contorted; coarse prostrate vines. 

 Anthers cohering in a head; plants ill- 

 scented 6. Cucurbita (p. 615). 



Anthers distinct or but slightly cohering; 

 plants not ill-scented. 

 Tendrils branched ; leaves deeply lobed ; 

 connective not produced beyond 



the anthers 7. Citrullus (p. 615). 



Tendrils not branched ; leaves not deep- 

 ly lobed; connective produced 

 beyond the anthers 8. Cucumis (p. 616). 



1. MARAH Kellogg. 



Herbaceous vine climbing by tendrils, with thin lobed leaves and small monoecious 

 flowers; staminate flowers in racemes or panicles; hypanthium broadly campanulate; 

 sepals 5 or 6; corolla white or greenish, rotate, 5 or 6-lobed; stamens 2 or 3, the fila- 

 ments united, the anthers nearly horizontal; pistillate flowers usually solitary, some- 

 times clustered in the axils, their calyx and corolla similar to those of the staminate 

 flowers; staminodia more or less prominent; ovary echinate, 1 to 4-celled; ovules 1 to 

 4 in each cell; fruit echinate, fibrous within. 



1. Marah gilensis Greene, Leaflets 2: 36. 1910. 



Megarrhiza gilensis Greene, Bull. Torrey Club 8: 97. 1881. 



Echinocystis gilensis Greene, Bull. Calif. Acad. 1: 189. 1885. 



Micrampelis gilensis Britton, Trans. N. Y. Acad. 8: 67. 1889. 



Type locality: In deep sand on the banks of the upper G'la River and its tribu- 

 taries, New Mexico. Type collected by E. L. Greene. 



Range : Southwestern New Mexico and adjacent Arizona. 



New Mexico: Burro Mountains (Rusby 141). 



2. ECHINOPEPON Naud. 



Annual herbs with cordate, entire or parted leaves; flowers monoecious, the stami- 

 nate m long racemes, with 5-lobed limbs; pistillate flowers solitary; ovary ovoid, 

 beaked, hispid or echinate, usually 3-celled. 



