BROOM-RAPE FAMILY 803 



mous, mostly included; filaments terete, adnate to the tube of the corolla; 

 anthers 2-celled or rarely 1-celled. Styles wholly united; stigma capitate 

 or 2-lobed. Fruit a capsule, enclosed in the withering corolla. Seeds very 

 many, anatropous, furrowed or tuberculate; endosperm transparent. 



Flowers subtended by bractlets. 1. MYZORRHIZA. 



Flowers without bractlets. 2. THALESIA. 



1. MYZORRHIZA Philippi. BROOM-RAPE. 



Whitish or pinkish herbs, parasitic on the roots of other plants. Leaves scale- 

 like, usually pubescent. Flowers spicate, racemose or corymbose, subtended by 

 bractlets. Calyx of 5, nearly equal, narrow lobes. Corolla 2-lipped; tube more 

 or less curved; throat open; lips erect. Capsule 1-celled, 2-valved. [Aphyllon 

 A. Gray, in part.] 



Flowers all manifestly pedicelled; inflorescence corymbose; anthers woolly. 



1. M. corymbosa. 

 Flowers sessile or nearly so; only the lowest sometimes short-pedicelled ; flowers spicate 



or paniculate. 

 Inflorescence spicate, though sometimes branched; corolla usually purple; stem not 



bulbose at the base. 



Corolla 20-25 mm. long; anthers woolly. 2. M. multiflora. 



Corolla 15-20 mm. long; anthers glabrous. 3. M. ludoviciana. 



Inflorescence usually a loose elongated panicle; corolla yellow, about 12 mm. long; 

 stem bulbose at the base. 4. M. pinorum. 



1. M. corymbosa Rydb. Stem 5-10 cm. high, glandular-puberulent; 

 scales about 1 cm. long, lance-ovate, acute; bracts linear, about 1 cm. long; bract- 

 lets linear-subulate; calyx-tube 4 mm. long; lobes lance-subulate; corolla dark 

 purple, about 2.5 cm. long; anthers woolly. Parasitic on composites, &c.: Mont. 

 Wyo. Ida. B.C. Submont. Mont. Jl. 



2. M. multiflora (Nutt.) Rydb. Stem 1-2 dm. high, glandular-puberulent; 

 scales ovate, acute, 1 cm. long; calyx-tube about 4 mm. long; lobes linear-lance- 

 olate, attenuate, 8-10 mm. long; corolla dark purple; lobes oblong, acutish. 

 Orobanche multiflora Nutt. Aphyllon multiflorum A. Gray. Parasitic, on Covillea 

 and other shrubs: Tex. s Colo. Utah Calif.; Mex. Son. My-Jl. 



3. M. ludoviciana (Nutt.) Rydb. Stem 0.5-2 dm. high, glandular-puberu- 

 lent, simple or branched; scales ovate, scarcely 1 cm. long; calyx-tube 3-^ mm. 

 long; lobes lanceolate, attenuate, 7-8 mm. long; corolla usually purple, rarely 

 yellowish; upper lip often only slightly cleft; lobes oblong, acute. 0. ludoviciana 

 Nutt. Parasitic on Artemisia and other Composites, &c., in sandy soil: Sask. 

 111. Tex. Calif. Wash. B.C. Plain Submont. Je-Au. 



4. M. pinorum (Geyer) Rydb. Stem 2-3 dm. high, glandular- and crisp- 

 hairy; scales lanceolate, acute; calyx-tube 3 mm. long; lobes lance-subulate, 4 

 mm. long; corolla-lips 3-4 mm. long, the upper 2-cleft, the lower 3-divided to 

 the base into lanceolate acute lobes. 0. pinorum Geyer. A. pinetorum A. Gray. 

 Parasitic on conifers: Ida. Wash. Submont. Je-Au. 



2. THALESIA Raf. CANCER-ROOT. 



Pale or pink root-parasites. Stem simple or branched. Leaves scale-like. 

 Calyx 5-cleft, with nearly equal lobes. Corolla slightly bilabiate; tube more or 

 less curved; upper lip 2-lobed; lower lip 3-lobed. Stamens included. Stigma 

 peltate. Capsule 1-celled, 2-valved, with 4 placentae. [Aphyllon Mitchell.] 



Calyx-lobes subulate, much longer than the tube; stem very short, 1-3-flowered. 



Corolla lilac or pink, 2 cm. or less long; tube 4-5 mm. wide at the throat; lobes oblong, 



acutish or obtuse. 1. T. sedi. 



Corolla deep purple, often with yellowish veins; lobes oval or semi-orbicular, rounded. 



Corolla 15-18 mm. long; tube strongly curved, 4-5 mm. wide at the throat. 



2. T. minuta. 

 Corolla 20-30 mm. long; tube not so strongly curved, 5-8 mm. wide at the throat. 



3. T. purpurea. 



Calyx-lobes lanceolate or triangular, about equalling the tube; stem evident, several- 

 flowered. 



Corolla purplish, its lobes rounded or merely mucronate; sepals more or less acumin- 

 ate. 4. T. fasciculata. 

 Corolla sulphur-yellow, its lobes acute; sepals acute. 5. T. lutea. 



