FLOWERING PLANTS AND FERNS OF ARTZONA 097 



racemose or corymbif orm ; corolla whitish, broadly cauipanulate, the 



lobes strap-shaped. S to 13 mm. long, strongly recurved at apex, the 

 segments of the crown subulate from a broad base, shorter than to 

 slightly longer than the corolla lobes; anthers round, conspicuously 

 scarious-tippcd; stigma 2-lipped; pods oblong-lanceolate in outline. 



1. Mellichampia sinaloensis (T. S. Brandeg.) Kearnev and Peebles, 



Wash. Acad. Sci. Jour. 29:488. 1939. 



Boxdlnla sinaloensis T. S. Brandeg., Zoe 5: 243. 190S. 



Along the Sonoita. Xogales to Patagonia, Santa Cruz County 

 {Peebles et al. 4654), Baboquivari Mountains, Pima County {Proctor, 

 Goodding, in 1936), August. Southern Arizona and western Mexico. 



The cream-white flowers are fragrant. 



10. GOXOLOBUS. Axglepod 



Stems trailing or weakly climbing; leaves opposite, subhastate to 

 sagittate-cordate at base; Sowers lateral (not axillary), solitary or in 

 umbellike clusters; corolla rotate-campanulate or funnelform-cam- 

 panulate, greenish or dull purple; stigma truncate or depressed. 



Key to the species 



1. Flowers solitary or in pairs, nearly sessile, with scarcely any common peduncle; 

 herbage canescent-puberulent, the hairs subappressed: leaf blades less 

 than 2 cm. long, not more than 1 cm. wide, deltoid-oblong, obtuse or acutish 

 at apex, shallowly hastate or subhastate at base; corolla 3 to 4 mm. long, 

 rotate-campanulate with spreading lobes and a very short tube: internal 

 crests of the crown segments attached to the column: pods fusiform, not 

 more than 1 cm. wide, sparsely warty 1. G. parvifolivs. 



1. Flowers in peduncled umbels, seldom solitary; herbage pilose, the hairs some- 

 what spreading; leaf blades up to 5 cm. long and 3 cm. wide, triangular- 

 ovate, attenuate-acuminate at apex, sagittate-cordate at base; corolla 

 more than 5 (commonly about 10) mm. long, funnelform-campanulate 

 with nearly erect lobes and a well-developed tube; internal crests of the 

 crown segments not attached to the column; pods ovoid, smooth. 



2. G. productus. 



1. Gonclobus parvifolius Torr., U. S. and Mex. Bound. Bot. 166. 



1859. 



Vincetoxicum parmjolium Heller, Muhlenbergia 1: 2. 1900. 



Western Gila County to Cochise, Pinal, Pima, and eastern Yuma 

 Counties, 2,200 to 5,000 feet, dry slopes and mesas, March to October. 

 Western Texas and southern Arizona. 



2. Gonolobus productus Torr., U. S. and Mex. Bound. Bot. 165. 



1859. 



Yincetoxicum productum Vail, Torrev Bot. Club Bui. 26: 431. 

 1899. 



Near Kirkland, Yavapai County {Peebles et al. 2607), Babocomari 

 Creek, Santa Cruz County (Lemmon 2821), apparently rare in Arizona. 

 June to August. Western Texas to Arizona. 



11. PHEROTRTCHIS 



Stems erect or ascending from a thick woody tuberlike root ; herbage 

 and calyx hispid-hirsute; leaf blades broadly oblong or ovate, rounded 

 or subcordate at base; flowers in lateral sessile or subsessile umbels; 

 corolla rotate-campanulate, the lobes lineate-veined, the segments of 

 the crown truncate; stigma capped by a large globose appendage. 



