JW 



1. R, americana. 



MISTLETOE FAMILY 817 



wde; spikes mostly solitary, 1.5-3 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 sohtary in the axils of the upper scales. Calyx 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 circAilar 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 distinc 



mously paniculate. 

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



Branches 1-2 mm. in diameter, . . « , . 



Plant yellowish green; accessory branchlets of fruitmg specimens flower-bearmg. 



Spikes short, 3-5-flowered; stems bluntly angled. 



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



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. cyanocarpa. 



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

 Branches 3^ mm. in diameter. 6, R. crypiopoda. 



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. 

 americamim Nutt. Parasitic on Pinus Murrayana, coniorla, 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 

 Pseudolsuga mucronata: Mont.^ — X.M. — Ariz. — Ore. — B.C. MoyiL 



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

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

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

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

 Larix occidenialis : Wash. — Mont. — Ida.— Ore. MojU. 



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- 

 rrroon- stfiTTiinate flowers 5^20 on the spikes: calyx-lobes usually 3, ovate, keeled: 



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

 ohve-o^reen 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. divaricaium Engelm. On Caryopiiys edulis and mono- 

 p/>y?Za: N.M.— Colo.— Utah— Ariz. Son. Au~S. 



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

 naniculate much branched, brownish-yellow to oli ve-browTi ; staminate plant 

 smaller than the pistiUate one; stammate spikes compressed; flowers mostly 

 ■^ merous 2 5-3 mm. wide: lobes ovate, acute; fruit 5 mm. long. A. cryptopodum 

 and robustum Engelm. On Pinu^ scopidorum, jxyjiderosa, anzonica, Jeffreyi, &c.: 

 jsj.jvi.— Colo.— Ariz. Son,— Mont 



Family 126. SANTALACEAE. Sandalwood Family. 



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

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

 greeS. Hypantliium well developed and enclosmg the ovary, adnate at 



30 



