848 FLORA. 



14. Utricularia biflora Lam. TWO-FLOWERED BLADDER WORT. (I. F. f. 3355.) 

 Scapes filiform, 5-13 cm. high, arising from long floating branches. Leaves scat- 

 tered, their divisions few, finely .capillary, often copiously bladder-bearing ; flowers 

 1-3, yellow; corolla 8-12 mm. broad, the lips rounded, nearly equal; spur narrow- 

 ly oblong, blunt, curved upward, equalling the lower lip. In shallow water, 

 eastern Mass, and R. I. to 111., La. and Tex. 



a. PINGUICULA L. 



Acaulescent herbs, with fibrous roots, naked I -flowered circinate scapes, and 

 basal tufted entire leaves, the upper surface covered, with a viscid secretion to which 

 insects adhere, and are captured by the involution of the sensitive leaf- margins. 

 Calyx 4-5-parted, or 2-lipped, the lower lip 3-parted, the upper 2-parted. Corolla 

 2-lipped, the upper lip 2-cleft, the lower 3-cleft; base of the corolla saccate and 

 contracted into a nectariferous spur. Capsule 2-valved or 4-valved. Seeds oblong, 

 wrinkled or reticulated. [Latin, pinguis, fat, the leaves seeming greasy to the 

 touch.] About 30 species, of wide distribution. Besides the following, 4 others 

 are found in the southern U. S. 



Scapes villous, 2-5 cm. high; leaves oval, 6-12 mm. long. i. P. villosa. 



Scapes glabrous or minutely downy ; leaves ovate or elliptic, 2-5 cm. long. 



2. P. vulgaris. 



1. Pinguicula villdsa L. HAIRY BUTTERWORT. (I. F. f. 3356.) Scapes 

 slender. Leaves 3 or 4, obtuse, 6-12 mm. long, 4-6 mm. wide; petioles short, vil- 

 lous; corolla pale violet with a yellowish-striped throat, 2-lipped, the upper lip 2- 

 parted, the lower larger, 3-parted, the tube abruptly contracted into a straight linear 

 or oblong blunt spur 3-4 mm. long. Lab. and Hudson Bay to Alaska. Also in 

 Greenland. Summer. 



2. Pinguicula vulgaris L. BUTTERWORT. BOG OR MARSH VIOLET. (I. F. 

 f. 3357.) Scapes 5-15 cm. high. Leaves 3-7, greasy to the touch on the upper 

 surface, obtuse, 2-5 cm. long, 6-20 mm. wide, short-petioled, or sessile; corolla 

 violet-purple, 6-8 mm. broad, the upper lip 2-lobed, the lower 3-lobed, larger, the 

 tube gradually contracted into a nearly straight spur 4-8 mm. long; capsule glo- 

 bose-ovoid, longer than the calyx. On wet rocks or in gravelly rivulet beds, 

 Greenland to Alaska, Vt., N. Y., Minn, and Br. Col. Also in Europe and Asia. 

 July-Aug. 



Family 11. OROBANCHACEAE Lindl. 

 Broom-rape Family. 



Erect root-parasites, the leaves reduced to alternate appressed scales, 

 the flowers perfect, irregular (rarely cleistogamous,) sessile in terminal 

 bracted spikes, or solitary and peduncled in the axils of the scales. 

 Calyx inferior, gamosepalous, 4-5-toothed, 4-5-cleft, or split nearly or 

 quite to the base on one or both sides. Corolla gamopetalous, oblique, 

 the limb 2-lipped, 5-lobed. Stamens 4, didynamous, inserted on the 

 tube of the corolla and alternate with its lobes, a fifth rudimentary one 

 occasionally present; filaments slender; anthers 2-celled, the sacs paral- 

 lel, equal. Ovary superior, i-celled, the four placentae parietal; ovules 

 numerous, anatropous ; style slender; stigma discoid, 2-lobed, or some- 

 times 4-lobed. Capsule i-celled, 2-valved. Seeds numerous, reticulated, 

 wrinkled or striate ; embryo minute ; cotyledons scarcely differentiated. 

 About ii genera and 200 species of wide distribution. 



Flowers all complete and perfect. 

 Calyx 2-s-toothed. 



Calyx about equally 5-cleft; no bracts on pedicels nor calyx, i. Thalesia. 

 Calyx unequally toothed, or split on both sides ; flowers bracted. 



2. Orobanche. 

 Calyx spathe-like, split on the lower side, 3~4-toothed on the upper. 



3. Conopholis. 

 Lower flowers cleistogamous, fertile ; upper complete, mostly sterile. 4. Leptamnium. 



