tJROBANCHACEAE (BROOM RAPE FAMILY) 463 



and sometimes with few or no leaves or bladders. Bladders furnished with a 

 valvular lid and usually with a few bristles at the orifice. Lips of the 2- 

 parted calyx entire, or nearly so. 



Leaves pinnately divided; corolla broad (12 mm.), with permanent spur . 1. U. vulgaris. 

 Leaves dichotomously divided; corolla half as broad. . . . .2. U. minor. 



1. Utricularia vulgaris L. Sp. PI. 18. 1753. Stems submersed, leafy, 

 3-12 dm. long: leaves numerous, alternate; blades 2-3-pinnately dissected 

 into filiform segments, usually bearing numerous bladders; bladders when 

 fully developed 3-5 mm. long: scapes erect, 1-3 dm. high: racemes 5-10- 

 flowered; pedicels 5-15 mm. long, recurving at maturity: calyx becoming 

 3-3.5 mm. long: corolla yellow, 12-15 mm. broad; the upper lip erect, nearly 

 entire; the lower lip spreading, slightly 3-lobed; spur not appressed, horn- 

 like, slightly curved, shorter than the lower lip: capsules many-seeded. In 

 brooks and ponds throughout most of the northern hemisphere. 



2. Utricularia minor L. 1. c. Scapes slender, 0.5-1.8 dm. high; branches 

 floating, short: leaf-divisions few and setaceous; bladders borne along the 

 leaves, few, often none, the largest not over 2 mm. long: flowers 1-10, pale 

 yellow, racemose: corolla 4-6 mm. broad, ringent, the upper lip smaller than 

 the lower; spur usually reduced to a blunt, broad protuberance, shorter than 

 the lips: pedicels reflexed in fruit. Shallow ponds and bogs; like the preced- 

 ing widely distributed. 



106. OROBANCHACEAE Lindl. BROOM RAPE FAMILY 



Commonly perennial herbs, destitute of green foliage and parasitic on the 

 roots of other plants. Stems sometimes almost wanting. Leaves scale-like. 

 Flowers perfect, or rarely dioecious. Calyx of 4 or 5 more or less united se- 

 pals, persistent; tube campanulate or tubular. Corolla persistent on wither- 

 ing; limb more or less bilabiate and irregular. Stamens 4, didynamous, 

 adnate to the corolla, mostly included; anthers 2-celled or rarely 1-celled, 

 leathery. Styles united, terminal; stigma capitate. or 2-lobed; ovules mostly 

 numerous, anatropous. Fruit a capsule, inclosed in the persistent corolla, 

 with 1 or apparently 2 cavities. 



Flowers spicate, sessile or subsessile, bracteate . , . . . -,- , . 1. Orobanche. 

 Flowers pedunculate and bractless ........ 2. Thalesia. 



1. OROBANCHE L. BROOM RAPE 



Parasitic herbs, on roots of various plants, commonly with yellowish or 

 brownish pubescent foliage. Leaves scale-like. Flowers spicate, with bract- 

 lets. Calyx with a deep sinus above and below, the lateral lobes often 2-cleft. 

 Corolla irregular; tube slightly curved; limb 2-lipped, the upper lip erect or 

 incurved, the lower lip spreading. Ovary 1-celled. Capsule 2-valved. Aphyl- 

 lon in part. 



Corolla 2 cm. or more long; anthers woolly . . . . 1. O. multiflqra. 



Corolla less than 2 cm. long; anthers glabrous . . . . . 2. O. ludoviciana. 



1. Orobanche multiflora Nutt. PI. Gamb. 179. 1847. Whole plant viscidly 

 pruinose-puberulent, 1-3 dm. high: flowers nearly sessile or the lower ones 

 short-pediceled : calyx bibracteolate, almost 5-parted into linear-lanceolate 

 lobes, fully half the length of the ample purplish corolla: anthers very woolly. 

 Gravelly plains and pine woods; western Texas to Arizona, extending into 

 Southern Colorado. 



2. Orobanche ludoviciana Nutt. Gen. 2: 58. 1818. Rather less pubescent: 

 spikes more frequently compound: calyx less deeply and somewhat unequally 

 5-cleft: corolla about half smaller; upper lip sometimes almost entire: anthers 



