GENUS 3. 



BLADDERWORT FAMILY. 



6. Utricularia geminiscapa Benj. Hid- 

 den-fruited Bladderwort. Fig. 3866. 



Utricularia geminiscapa Benj. Linnaea 20: 305. 



1847. 

 U. clandestina Nutt. ; A. Gray, Man. 287. 1848. 



Stems about 8'-io' long, floating horizontally 

 beneath the surface of the water, sparingly 

 branched. Leaves alternate, about 10" long, 

 4-7-dichotomous, and bladderless, or more or 

 less reduced and bladder-bearing; scape slen- 

 der, 2'-s' high, 2-5-flowered, without scales; 

 cleistogamous flowers solitary on short pedun- 

 cles, I at the base of the scape and others scat- 

 tered along the stems, often in pairs; pedicels 

 of conspicuous flowers 2"-3" long; corolla 

 yellow, 3" long or more, the lower lip longer 

 and broader than the upper, 3-lobed, with a 

 prominent palate; spur a little shorter than 

 the lower lip, obtuse. 



In shallow water, New Brunswick to Virginia. 

 Hooded or horned milfoil. July-Aug. 



7. Utricularia macrorhiza LeConte. 



Greater Bladderwort. Hooded 



Water Milfoil. Pop-weed. 



Fig. 3867. 



Utricularia macrorhiza LeConte, Ann. Lye. N. Y. 



i : 73. 1824. 



U. vulgaris var. americana A. Gray, Man. Ed. 5, 

 318. 1867. 



Stems i-3 long, floating horizontally be- 

 neath the surface of the water, sparingly 

 branched. Leaves alternate, J'-2' long, dichot- 

 omous at the base, each ray pseudo-pinnately 

 divided, bladder-bearing, the bladders some- 

 times 2" long; scape stout, 3 '-24' high, 6-20- 

 flowered, with 1-5 auriculate scales; pedicels 

 3"-8" long, becoming 5"-io" long and recurved 

 at maturity of fruit; corolla yellow, 7"-io" 

 long, the lower lip a little longer and much 

 broader than the upper, with a spreading, un- 

 dulate, slightly 3-lobed border, and a promi- 

 nent palate ; spur shorter than the lower lip, 

 subulate, upwardly curved, acute or obtuse. 



In stagnant water or sluggish streams, New- 

 foundland to Yukon, south to Maryland, Missouri, 

 Oklahoma, Arizona, and Lower California. May-Aug. Often propagated by winter-buds. Very 

 variable, but appears to differ constantly from the related and equally variable^European species, 

 Utricularia vulgaris L., by the longer stems, the 

 shape and direction of the spur, and the minute- 

 ness of the appendages (rudimentary stolons) at 

 the base of the scape. 



8. Utricularia radiata Small. Small 

 Swollen Bladderwort. Fig. 3868. 



Utricularia inflata var. minor Chapm. Fl. S. U. S. 



282. 1860. Not U. minor L. 1753. 

 Utricularia radiata Small, Fl. SE. U. S. 1090. 1903. 



Stems long, floating horizontally beneath 

 the surface of the water. Leaves alternate, 

 6-io-dichotomous, usually less than li' long, 

 bladder-bearing; scape i-4-flowered, with a 

 whorl of 4-7 inflated floats, above the floats 

 ii'-4' high; floats up to i*' long, lobed and 

 finely dissected toward the apex ; pedicels 4"- 

 10" long; corolla 6"-g" long, the upper lip 

 suborbicular, undulate, the lower lip about the 

 same length but broader, 3-lobed, with a 

 prominent 2-lobed palate; spur conic, obtuse, 

 appressed to and shorter than the lower lip. 



In ponds, Maine to Florida and Texas, near the 

 coast. March-Sept. 



