586 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



9. LEIOSTEMON Raf. 



Slender, much branched perennial herbs, about 80 cm. high or less, with narrow 

 leaves and showj' paniculate flowers; corolla hardly bilabiate, obliquely salverform, 

 white or tinged with red outside; fifth stamen glabrous, occasionally with a nidimentarj' 

 anther. 



KEY TO THE SPECIES. 



Tube of corolla 10 to 15 mm. long; throat little dilated 1. L. ambiguus. 



Tube of corolla 5 mm. long or less; throat much dilated 2. L. thurberi. 



1. Iieiostemon ambiguus (Torr.) Greene, Leaflets 1: 223. 1906. 

 Pentstemon ambiguus Torr. Ann. Lye. N. Y. 2: 228. 1828. 

 Leiostemon purpureus^ai. Atl. Joum. 145. 1833. 



Type locality: "Near the Rocky Mountains," Colorado or New ^lexico. 



Range: Utah and Colorado to western Texas and southern California. 



New Mexico: Clayton; Nara Visa; Albuquerque; Aden; Hop Canyon; Jarilla; 

 south of Melrose; Buchanan. Dry hills and plains, in the Lower and Upper Sonoran 

 zones. 



2. Leiostemon thurberi (Torr.) Greene, Leaflets 1: 223. 1906. 

 Pentstemon thurberi Torr. U. S. Rep. Expl. Miss. Pacif. 7: 15. 1857. 

 PentMemon ambiguiis thurberi A. Gray, Proc. Amer. Acad. 6: 64. 1862. 



Type locality: Burro Mountains, New Mexico. Tj^e collected by Autisell in 

 August, 1854. 



Range: New Mexico and Arizona to northern Mexico. 



New Mexico: Magdalena Mountains; Albuquerque; near Juniper Spring; Carrizozo; 

 Gage. Dry hills and plains, in the Lower and Upper Sonoran zones. 



10. GRATIOLA L. Hedge hyssop. 



Low annual, 30 cm. high or mostly less, with narrow sessile leaves and small axillarj- 

 flowers on peduncles nearly equaling the leaves; calyx lobea nearly equal; corolla 

 deeply bilabiate, the upper lip entire or 2-cleft, the lower 3-cleft; capsules 4-valved, 

 many-seeded. 



1. Gratiola virginiana L. Sp. PI. 17. 1753. 



Type locality: "Habitat in Virginia." 



Range: British America to CaUfomia and Florida. 



New Mexico: Chama (StandJei/ 6659); Brazos Canj^on (Standley d- Bollma^i). 

 Wetgroimd, in the Transition Zone. 



11. MEMULUS L. Monkey flower. 



Annual or perennial herbs, usually growing in wet soil, 50 cm. high or less, with 

 solitary, axillary, or by the reduction of the leaves racemose flowers; sepals luiited 

 into a 5-angled tube with short obUque limb; corolla strongly 2-lipped, yellow or 

 purple, the upper lip spreading or reflexed, the lower erect; stamens 4; capsules 

 locuUcidally dehiscent, inclosed in the persistent papery calyx. 



KEY to the species. 



Corolla i^urple or reddish. 



Corolla 8 mm. long or less; annual 1. M. rubellus. 



Corolla 35 mm. long or more; perennial 8. M. cardinalis. 



Corolla yellow. 



Corolla tube twice as long as the calyx 2. M. parvulus. 



Corolla tube little or not at all exceeding the calyx. 



Calyx teeth equal; leaves elliptic or narrowly oblong 3. M. gratioloides. 



