PINGUICULACEAE. 265 



Calyx 5-lobed, the lobes narrow. Corolla nearly regular. Capsules 6-20-seeded. 

 1. R. strepens L. Stems 2-12 dm. tall, glabrous or finely pubescent: leaf- 

 blades ovate to oblong, 5-15 cm. long: corolla blue or nearly white, 5-6 cm. 

 long: capsules 10-15 mm. long. Rare, along the Conestoga Creek, near Lan- 

 caster. Limestones. Sum. 



2. DIANTHERA [Gronov.] L. Perennial herbs. Leaf -blades entire or 

 rarely toothed. Flowers on axillary peduncles. Calyx 4-5-lobed, the lobes 

 narrow or slender. Corolla strongly 2-lipped: upper lip entire or 2-lobed: 

 lower lip 3-lobed. Capsules mostly 4-seeded. 



1. D. americana L. Stems 3-10 dm. tall: leaf -blades linear to linear-lanceo- 

 late or narrowly oblong, 5-15 cm. long: peduncles ascending, about as long 

 as the leaves or longer: spikes 1-3 cm. long, continuous: calyx-lobes linear, 

 4-5 mm. long: corolla white, pink, or purplish: capsules 1.5-2 cm. long. 

 Common, in streams. Sum. WATER- WILLOW. 



FAMILY 12. PINGUICULACEAE. 1 BLADDERWORT FAMILY. 



Herbs, growing in water or in wet places. Leaves submersed and dis- 

 sected, sometimes resembling rootlets and often bladder-bearing, or aerial, 

 entire, or rarely wanting. Scapes naked or minutely scaly, one-many- 

 flowered. Flowers irregular, perfect. Calyx of 2-5 herbaceous sepals. 

 Corolla 2-lipped : tube spurred or saccate. Androecium of 2 stamens, 

 adnate to the base of the corolla-tube on its upper side. Filaments flat- 

 tened, twisted. Anthers confluently 1-celled. Gynoecium a single 1-celled 

 pistil, with a free-central, usually globose placenta. Style thick. Stigma 

 often 2-lipped, the lips unequal. Ovules numerous. Fruit a capsule, 2- 

 valved or irregularly dehiscent. Seeds numerous. 



1. UTRICULARIA L. Aquatic or terrestrial scapose herbs. Stems hori- 

 zontal, creeping on the surface of the ground in wet places, or in shallow 

 water, free-swimming. Leaves commonly finely dissected, bladder-bearing, 

 often reduced, rarely wanting. Flowers solitary or racemose. Sepals 2, 

 slightly united. Corolla 2-lipped, the lower lip produced into a spur at the 

 base. Capsule commonly irregularly dehiscent, several- or many-seeded. 

 Sum. BLADDERWORT. 



Scapes solitary at the nodes of elongate, more or less free-swimming stems. 



1. V. vulgaris. 

 Scapes solitary or several together, the stems radiating from their 



bases and often more or less root-ilke. 2. U. fifib&o. 



1. U. vulgaris L. Stems submersed, leafy, 3-12 dm. long: leaves numerous, 

 alternate; blades 2-3-pinnately dissected into filiform segments, usually bear- 

 ing numerous bladders; bladders when fully developed 3-5 mm. long: scapes 

 1-3 dm. tall: racemes 5-10-flowered : pedicels recurving at maturity: corolla 

 yellow, 12-15 mm. broad, the lower lip slightly 3-lobed; spur not appressed, 

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

 Susquehanna valley. In water. 



2. U. gibba L. Stems radiating from the base of the scape or scapes, several 

 cm. long, delicate, root-like: leaves scattered, sparingly divided; segments 

 capillary, with few minute bladders: scapes 2-10 cm. tall: racemes 1-3-flowered, 

 usually 2-flowered: pedicels very slender, erect or ascending: corolla yellow, 

 5-7 mm. broad ; spur obtuse, shorter than the lower lip. Susquehanna valley. 

 In very shallow water. 



1 Contributed by Dr. John Hendley Barnhart. 



