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 Hexilis, 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- 

 podnm 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. 



i. COMANDRA Nutt. BASTARD TOAD-FLAX. 



i. 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. i. 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. 



i. 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. 



