KEY TO THE SPECIES 73 



3. Physalis rendleri Gray (Fendler's Ground-cherry). Obscurely glandu- 

 lar or merely pruinose puberulent, 1-3 dm. high ; leaves small, ovate, coarsely sin- 

 uate-toothed, with abrupt or sub-cordate base ; corolla yellow with brownish 

 center ; berry yellow. Plains and canons southward. 



3. DATURA (JiMSON-wEED. Thorn-applb) 



Bank weeds with ovate leaves, large showy flowers in the forks of the branch- 

 ing stem, prismatic and toothed calyx, funnel-form corolla with large and spread- 

 ing plaited border, a 2-lipped stigma, and fruit a globular prickly pod. 



1. Datura Stramonium. Smooth with green stem ; leaves sinuate-toothed 

 or angled ; corolla white, 6-8 cm. long ; lower prickles of the pod usually shorter. 

 Waste ground. Fi'om Asia. 



2. l>atura Tatula. Mostly taller ; stem purple ; corolla pale violet-purple ; 

 prickles of the pod nearly equal. Waste ground. From tropical America. 



LXI. SCROPHULARIACEiE (Figwokt Family) 



Herbs with 2-lipped or less irregular corolla, 4 unequal sta- 

 mens (sometimes 2 or 5) on the corolla-tube, a single style and 

 a superior 2-celled ovary becoming a many -seeded pod. 



* stamens 5. 



1. Verbascum. Corolla rotate ; filaments bearded. 



* » Stamens 2. 



2. Synthyris. Corolla wanting or unequally 2 or more lobed or cleft ; calyx 

 4-lobed or cleft ; leaves alternate. 



3. Veronica. Corolla rotate, 4-lobed ; leaves opposite. 



* * » Stamens 5, only 4 anther bearing. 



4. Pentstemon. Corolla tubular or funnel-form ; sterile stamen as long as 

 the others. 



* « ♦ * Stamens 4, with a rudiment of the fifth, as a scale or gland. 



5. Scrophularia. Corolla globular saccate, unequally 5-lobed ; the fifth sta- 

 men represented by a scale on the upper side of the corolla. 



6. Collinsia. Corolla 2-lipped, the middle lobe of the lower lip sac-like and 

 inclosing the stamens ; the fifth stamen represented by a gland at the base of the 

 corolla. 



***** Stamens 4, not inclosed by the upper lip of the corolla. 



7. Mimulus. Corolla 2-lipped, the upper lip 2- and the lower 3-lobed ; calyx 

 prismatic, S-angled and 5-toothed. 



****** Stamens 4, ascending under the upper lip and inclosed by it. 

 +- Anther sacs unequal or dissimilar— one affixed by the middle, the other 

 hanging by its apex. 



8. Castllleja. Calyx tubular ; upper lip of corolla much longer than the 

 lower. 



9. Ortbocarpus. Calyx tubular-campanulate ; upper lip scarcely exceeding 

 the lower. 



4- -I- Anther sacs similar and parallel. 

 6 



