LORANTHACEAE. 
101 
Plant greenish-brown; accessory branches merely leaf-bearing (on Caryopitys 
edulis and monophylla). 4. R. divaricata. 
Branches 3-4 mm. in diameter (on Pinus scopulorum, and ponderosa). 
5. R. cryptopoda. 
1. Razoumofskya americana (Nutt.) Kuntze. ( Arceuthobium Americanum 
Nutt.) Parasitic on Pinus Murrayana, contorta and divaricata, from Sask. 
and B. C. to Colo, and Ore.—Dillon; Grand Lake; Sunset. 
2. Razoumofskya Douglasii (Engelm.) Kuntze. ( A. Douglasii Engelm.) 
Parasitic on Pseudotsuga, from Ida. to N. M.—South Cheyenne Canon; El 
Paso Co.; West Mancos Canon. 
3. Razoumofskya cyanocarpa A. Nels. Parasitic on Pinus Uexilis, from 
Wyo. to Colo.—Cheyenne Mountain. 
4. Razoumofskya divaricata (Engelm.) Kuntze. ( A . divaricatum Engelm.) 
Parasitic on Caryopitys edulis and monophylla. —Mancos; Dillon. 
5. Razoumofskya cryptopoda (Engelm.) Coville. ( Arceuthobium crypto- 
podum Engelm.; A. robustum Engelm.) Parasitic on Pinus scopulorum and 
ponderosa. —Between Sunshine and Ward, Boulder Co.; West Indian Creek; 
Custer Co.; Stove Prairie Hill; Rist Canon. 
Family 43. SANTALACEAE R. Br. Sandal-wood Family. 
1. COMANDRA Nutt. Bastard Toad-flax. 
1. Comandra pallida A. DC. On plains and hills from Man., Alb. and B. C. 
to N. M. and Utah.—Alt. 4000-8000 ft.—Van Boxle’s ranch, above Cimarron; 
Cucharas River, below La Veta; Wahatoya Creek; Los Pinos; Steamboat 
Springs; Mancos; Fort Collins; Boulder; Dolores; along Poudre River; 
Horsetooth Gulch; Colorado City; Pinkham Creek, Larimer Co. 
Order 23. POLYGONALES. * 
Family 44. POLYGONACEAE Lindl. Buckwheat Family. 
Flowers subtended by involucres; stamens 9. 1. Eriogonum. 
Flowers not involucrate; stamens 4-8. 
Stigmas tufted. 
Perianth 6-parted; styles 3-parted; achenes 3-angled. 2. Rumex. 
Perianth 4-parted; style 2-parted; achenes lenticular. 3. Oxyria. 
Stigmas capitate. 
Leaf-blades jointed at the base; ochreae 2-lobed, becoming lacerate; filaments 
at least the inner dilated. 4. Polygonum. 
Leaf-blades not jointed at the base; ochreae not 2-lobed; filaments slender. 
Ochreae cylindric, truncate. 5. Persicaria. 
Ochreae oblique, more or less open on the side facing the leaf. 
Simple strict herbs with terminal spikes; perianth-lobes not keeled. 
6. Bistorta. 
Twining vines with flowers in axillary clusters; outer perianth-lobes 
winged or keeled. 7 - Tiniaria. 
1. ERIOGONUM L. 
Achenes 3-winged; perianth not accrescent. I. Alata. 
Achenes merely 3-angled; perianth accrescent in fruit. 
Perianth with a stipe-like base. 
Involucres in branching cymes. 
II. Eriantha. 
