1. Ibervillea tenuisecta (A. Gray) Small, Fl. Southeast. U. S. 1136. 

 1903. 



Sicydium lindheimeri A. Gray var. tenuisecta A. Gray, PL 

 Wright. 1: 75. 1852. 



The writers have seen no specimens from Arizona, but the plant is 

 reported to occur in Guadalupe Canyon (Cochise County) in the 

 extreme southeastern corner of the State. Western Texas to south- 

 eastern Arizona and northern Mexico. 



3. TUMAMOCA 



A slender-stemmed glabrous perennial with a cluster of thick tuber- 

 like roots; leaves thin, pedately 3-parted, the divisions deeply cleft or 

 parted into narrow segments ; flowers monoecious, the staminate ones 

 in short racemes, the pistillate flowers solitary; calyx tube slender; 

 corolla pale yellow, the lobes narrow; fruit a globose several-seeded 

 berry, red or yellow at maturity. 



1. Tumamoca macdougalii Rose, Contrib. U. S. Natl. Herbarium 16: 

 21. 1912. 



Known in Arizona only from the type locality, Tumamoc Hill, near 

 Tucson (Pima County), about 2,500 feet, dry soil among rocks, climb- 

 ing over bushes. Southern Arizona and Sonora. 



Ira L. Wiggins, who discovered the Sonoran station for this very 

 rare plant, near Carbo, wrote (personal communication): "Root 

 tuberous, each tuber 5 to 12 cm. long; flowers greenish; plants trailing 

 on the ground or climbing 1 to 1.5 m. in a tangled mass in bushes. 

 The tubers smell like decaying cabbage when bruised." 



4. CUCURBITA 



Coarse perennial herbs with trailing stems from a large thick root, 

 the herbage harshly appressed-pubescent; flowers few, unisexual 

 (monoecious) ; corolla yellow, 3 cm. long or longer, the tube campanu- 

 late, much longer than the lobes; stamens with separate filaments and 

 connate anthers; fruit globose, smooth, gourdlike. 



Key to the species 



1. Leaf blades triangular-ovate, longer than wide, at most shallowly angulate- 

 lobed, acuminate, up to at least 30 cm. long, the upper face uniformly 



pubescent 1. C. foetidissima. 



1. Leaf blades palmately 5-cleft or 5-parted, the lobes or divisions entire or angu- 



lately few-toothed, the upper face conspicuously more pubescent along the 



veins than elsewhere, the lower face uniformly pubescent (2). 



2. Blades up to 25 cm. long, cleft very nearly to the base, with lanceolate, often 



very narrow lobes, the upper face dark green, with conspicuous broad 



bands of white pubescence along the veins, otherwise nearly glabrous. 



2. C. DIGITATA. 



2. Blades not more than 10 cm. long, cleft not nearly to the base, with deltoid 

 lobes, the upper face light green, with pubescence less restricted to the 

 veins 3. C. palmata. 



1. Cucurbita foetidissima H. B. K., Nov. Gen. et Sp. 2: 123. 1817. 



Navajo and Coconino Counties to Cochise and Maricopa Counties, 

 1,000 to 7,000 feet, mostly in alluvial soil, often at roadsides, May to 

 August. Missouri and Nebraska to Texas, Arizona, southern Cali- 

 fornia, and Mexico. 



