368 Karl M. Wiegand and Arthur J. Eames 



4. Datura L. 



1. D. Stramonium L. Jimsox Weed. Thorn Apple. Stramonium. 



Rich gravelly soil in waste places ; scarce. Aug.-Sept. 



Between Railroad Ave. and Fall Creek, Ithaca, formerly; shore of Cayuga Lake 

 (D.) ; Highland Ave., Cayuga Heights. 



N. S. to Minn., southw. to Fla. and Tex. Naturalized from tropical regions. 



Both white- and purple-flowered individuals occur. The purple ones have been 

 separated as var. chalibea Koch (D. Tatitla L., see Rouy and Foucaud, Fl. France 

 10:371, 1908). Variations in the length and the number of prickles on the capsule 

 have been noted by students of genetics, but these variations are not correlated with 

 the color of the flowers. It seems unwise to attempt the recognition taxonomically 

 of the variability of these characters. 



112. SCROPHULARIACEAE (Figwort Family) 



Artificial Key to the Genera 

 a. Corolla personate. 



t>. Corolla spurred at base; calyx normal, not angled. 2. Linaria 



b. Corolla spurless at base; calyx enlarged and angled. 6. MlMULUS 



a. Corolla not personate. 



b. Fertile stamens 5; corolla rotate, nearly regular. 1. Verp.ascum 



b. Fertile stamens 2; corolla often rotate (see also 3d b). 



c. Corolla rotate, salver-form, or tubular ; stamens much exposed or exserted, 



sterile ones wanting. 9. Veronica 



c. Corolla tubular or bilabiate; fertile stamens not exserted beyond the upper lip. 

 d. Sterile filaments slender, slightly exserted, 2-lobed. 7. Ilysanthes 



d. Sterile filaments short or wanting, included, simple. 8. Gratiola 



b. Fertile stamens 4 ; corolla never rotate. 



c. Corolla scarcely 2-lipped, the limb but slightly irregular. 

 d. Sterile fifth stamen well developed; upper 2 lobes of corolla covering the 



lower 3 lobes in the bud. 4. Penstemox 



d. Sterile stamen wanting ; lower 3 lobes of corolla covering the upper 2 lobes 

 in the bud. 

 e. Flowers yellow ; anther sacs parallel, awned at base ; capsule acute or 



acuminate. 10. Aureolaria 



e. Flowers pink or purple; anther sacs more or less divergent, obtuse to 

 mucronate at base; capsule rounded and mucronate at apex. 



11. Agalinis 

 c. Corolla manifestly 2-lipped. 



J. Lips very unequal, the upper one narrow, elongated, about four times the 

 length of the lower one; bracts often colored and lobed. 



12. Castilleja 

 d. Lips more nearly equal ; bracts not colored, rarely lobed. 



c . Upper lip 4-lobed, lower lip entire ; flowers in a naked panicle. 



3. Scrgphularia 

 e. Upper lip 2-lobed, lower lip 3-lobed; flowers racemose or spicate on the 

 stem and branches. 

 /. Flowers large, color white or pinkish; limb of corolla dorsoventrally 



flattened ; leaves sharply serrate. 5. Cheloxe 



"/• Flowers smaller, color purple, brownish, or yellowish ; limb of corolla 

 not dorsoventrally flattened. 

 g. Leaves pinnately lobed and crenate ; bracts not spiny-toothed. 



13. Pedicularis 

 </. Leaves entire; bracts distinctly spiny-toothed. 14. Melampyrum 



