226 LIMNANTHACEAE. 



2. SCHMALTZIA Desv. SUMAC. 



Leaflets 931 ; flowers appearing after the leaves. i. S. glabra. 



Leaflets 13 ; flowers appearing before the leaves. 2. S. trilobata. 



1. Schmaltzia glabra (L.) Small. (Rhus glabra L.) Along streams, in 

 thickets and on hills from N. S. and B. C. to Fla. and Ariz. Alt. 4000-6000 

 ft. Cheyenne Canon, near Pike's Peak ; Lower Boulder Canon, Boulder Co. ; 

 foot-hills, Larimer Co. ; vicinity of Arthur's Rock ; gulch west of Pennock's. 



2. Schmaltzia trilobata (Nutt.) Small. (Rhus trilobata Nutt.) On dry 

 hills from Ass. and Wash, to Mo., Tex. and Calif. ; also Mex. Alt. 4000-8000 

 ft Boulder; Colorado Springs; Buena Vista; Trinidad; southeast of La 

 Veta ; Manitou ; Ft. Collins ; Cedar Hills ; along Poudre ; Rist Canon ; Horse- 

 tooth Gulch ; gulch west of Soldier Canon ; Spring Canon ; Howe's Gulch. 



Family 82. CELASTRACEAE Lindl. STAFF-TREE FAMILY. 



Petals, sepals and stamens 4 ; ovary 2-celled ; each cell with 2 ovules ; depressed 



or trailing evergreen shrubs, not spiny. i. PACHYSTIMA. 



.Petals and sepals 5; stamens 5-10; ovary i -celled with 2 ovules; small erect 



shrubs with angled, green, often spinescent branches. 2. FORSELLESIA. 



i. PACHYSTIMA Raf. 



i. Pachystima Myrsinites (Pursh) Raf. In woods from Mont, and B. C. 

 to N. M. and Calif. Alt. 6000-10,000 ft. Headwaters of Clear Creek; near 

 Empire; Mt. Ouray; Crystal Creek; East and West Indian Creek; near La 

 Plata Post Office ; Steamboat Springs ; Glenwood Springs ; Four-Mile Hill, 

 Routt Co. ; west and southeast of Ouray ; Rico ; Big Creek Gulch, Routt Co. ; 

 Trapper's Lake ; Black Canon of Gunnison ; Ragged Mountain, Gunnison Co. ; 

 mountains near Silverton; bank of Fish Creek; Hematite. 



2. FORSELLESIA. Greene. 



Stamens 5-7. i. F. meionandra. 



Stamens 10. 2. F. spinescens. 



1. Forsellesia meionandra (Koehne) Heller. (Glossopetalon meionandrutn 

 Koehne) In arid regions of southern Colorado. Exact location not given. 



2. Forsellesia spinescens (A. Gray) Greene. (Glossopetalon spinescens A. 

 Gray) In desert regions from Ore. to Tex. and Calif. Grand Junction; 

 Hovensweep Castle (Brandegee). 



Family 83. ACERACEAE J. St. Hil. MAPLE FAMILY. 



Leaves with simple or rarely digitately divided blades ; flowers polygamo-dioecious. 



i. ACER. 

 Leaves with pinnately compound blades ; flowers dioecious. 2. RULAC. 



i. ACER L. MAPLE. 



Flowers polygamous in racemes or corymbs ; petals and sepals both present ; 



disk well developed; lobes of the leaves toothed. i. A. glabrum. 



Flowers monoecious, in umbels ; petals lacking ; lobes of the leaves sinuate. 



2. A. grandidentatum. 



