MISTLETOE FAMILY 817 



wide; spikes mostly solitary, L5-3 cm. in flower, becoming 4-5 cm. long, gla- 

 brous, 4-jointed, each joint bearing near the top 6 pistillate or 20-30 staminate 

 flowers; bracts ciliate; berry white, glabrous, 4 mm. thick. Parasitic on poplars, 

 willows and ashes: Tex. — s Colo. — N.M.; Chihuahua. Son. 



2. RAZOUMOFSKYA Hoffm. 



Small shrubby fleshy parasites, mostly dioecious. Leaves opposite, reduced 

 to scales. Flowers solitary in the axils of the upper scales. Calj'x of the stam- 

 inate flowers 2-5-lobed, usually 3-lobed. Stamens as many as and adnate to 

 the lobes; anthers sessile, 1-celled, opening by a transverse circular slit. Hypan- 

 thium of the pistillate flowers enlosing the ovary. Calyx-lobes 2, persistent 

 on the fruit. Berry ovoid, more or less flattened. [Arceuthobium Bieb.] 



Staminate flowers all or nearly all at the ends of the branches, on distinct pedicels, dichoto- 



mously pamculate. 1. R. americana. 



Staminate flowers nearly all axillary, forming simple or compound spikes. 

 Branches 1-2 mm. in diameter. 



Plant yellowish green; accessory branchlets of fruiting specimens flower-bearing. 

 Spik&s short, 3-.5-flowered ; stems blimtly angled. 



Rather simple, 1-3 cm. high; leaves and sepals obtusish, not distinctly 



keeled. 2. R. Douglasii. 



Stout, 3-5 cm. high, branched; leaves and sepals decidedly acute and keeled. 



3. R. laricis. 

 Spikes many-flowered; stems sharply angled. 4. R. cyanncarpa. 



Plant greenish brown ; accessory branches merely leaf-bearing. 5. R. divaricala. 

 Branches 3—1 mm. in diameter. 6. R. cryptopoda. 



1. R. americana (Nutt.) Kuntze. Stems dichotomously and verticillately 

 branched, greenish yellow; staminate plant 5-10 cm. high, 1-2 mm. thick at 

 the base; pistillate plant 2-5 cm. high; staminate flowers 2 mm. wide; lobes 

 round-ovate; pistillate flowers somewhat smaller; fruit 2 mm. long, bluish. A. 

 americanum Nutt. Parasitic on Pinus Murrayana, coniorta, and divaricala: Sask. 

 —Colo.— Ore.— B.C. Mont. Au-0. 



2. R. Douglasii (Engelm.) Kuntze. Plant slender, 1-3 cm. high, greenish yel- 

 low, dichotomously branched; branches simple or with accessory branches behind the 

 first; flowers in short usually 5-flowered spikes, less than 2 mm. wide, the staminate 

 ones with round-ovate calyx-lobes; fruit 5 mm. long. A. Douglasii Engelm. On 

 Paeudotsuga mucronala: Alont. — N.M. — Ariz. — Ore. — B.C. Mont. 



3. R. laricis Piper. Divaricately branched, 3-5 cm. high, greenish yellow; 

 branches angled; flowers in short 3-7-flowered spikes, the staminate ones fully 

 2 mm. wide, 3-merous; lobes ovate, abruptly acute; scales (reduced leaves) de- 

 cidedly acute; fruit unknown. A. Douglasii Laricis (Piper) M. E. Jones. On 

 Larix occidcntalis: Wash. — Mont. — Ida. — Ore. Mont. 



4. R. cyanocarpa A. Nels. Stems simple or branched below, the staminate 

 ones 2-3 cm. high, sharply 4-angled, yellowish green, the pistillate ones olive- 

 green; staminate flowers 5-20 on the spikes; calyx-lobes usually 3, ovate, keeled; 

 berry obovate, bluish green. On Apinus flexilis: Wyo. — Colo. Mont. Jl-S. 



5. R. divaricata (Engehn.) Kuntze. Stem 5-10 cm. high and 2 mm. thick, 

 oUve-green to pale brownish; branches often spreading and recurved, only leaf- 

 bearing; staminate flowers in 1-7-flowered spikes, 2 mm. wide; lobes ovate, acute; 

 fruit 3-4 mm. long. A. divaricatum Engelm. On Caryopitys edulis and mono- 

 phylla: N.M.— Colo. — Utah— Ariz. Son. Au-S. 



6. R. cryptopoda (Engelm.) Coyille. Stout, 5-10 cm. high, 4-6 mm. thick, 

 paniculate, much branched, brownish-yellow to ohve-browm; staminate plant 

 smaller than the pistillate one; staminate spikes compressed; flowers mostly 

 3-merous, 2.5-3 mm. wide; lobes ovate, acute; fruit 5 mm. long. A. cri/ptopodum 

 and robustum Engelm. On Pinus scopulorum, ponderosa, arizonica, Jeffrcyi, &c.: 

 N.M. — Colo. — Ariz. Son. — Mont. 



Family 126. SANTALACEAE. Sandalwood Family. 



Herbs, shrubs, or trees, nnostly root-parasites or saprophytes. Leaves 

 without stipules, simple. Flowers perfect, monoecious, or dioecious, mostly 

 greenish. Hypanthium well developed and enclosing the ovary, adnate at 

 30 



