The Flora of the Cayuga Lake Rasin 205 



ing. It mostly replaces it on the higher ground farther from the lake, e. of Levanna 

 and Union Springs" (£>.). This seems to be a plant of more calcareous regions and 

 of richer soil than the preceding, also often of more swampy soil. 



N. S. to Sask., southw. to Ohio, Mo., and along the mts. to N. C. ; rare or absent 

 on the Coastal Plain. 



2. Portulaca (Tourn.) L. 



1. P. OLERACEA L. COMMON PURSLANE. 



A weed in cultivated ground and waste places where the soil is not too heavy ; 

 common. July-Sept. 



Nearly throughout N. A. Naturalized from Eu. Formerly cultivated as a potherb. 



47. CERATOPHYLLACEAE (Hornwort Family) 

 1. Ceratophyllum L. 

 1. C. demersum L. Hornwort. 



Submerged in pools and bays, and in marshes ; common. June-July ; f r. Aug. 

 Throughout N. A. except in the extreme North. 



48. NYMPHAEACEAE (Water Lily Family) 



a. Sepals 4-6; petals many, in several rows; ovary 1, 8-30-celled; leaves oval or 

 orbicular, cordate. 

 b. Petals and stamens hypogynous, the petals inconspicuous, yellow. 



1. Nymphozanthus 

 b. Petals and stamens inserted on the sides and near the summit of the ovary, 

 the petals showy, white. 2. Nymphaea 



a. Sepals and petals each 3-4; carpels 4-18, separate; leaves oval, peltate (see also 



3d a). 3. Brasenia 



a. Sepals many, in several rows, passing into the many petals ; carpels several, free, 

 sunken in the enlarged receptacle ; leaves suborbicular, peltate. 



4. Nelumbo 



1. Nymphozanthus Richard 



a. Flowers 4-6 cm. in diam. ; stigma mostly 12-20-rayed, yellow or pale red ; fruit 

 with the persistent, partly decayed stamens at base; leaves large, 17-33 cm. 

 long, thick, the basal lobes about half as long as the body. 

 b. Leaves erect, with terete petioles and a usually open sinus ; sepals green-tinged 



inside at base; fruit green. 1. N. advena 



b. Leaves floating, with flattened petioles and a closed or narrow sinus ; sepals 



red^tinged inside at base ; fruit reddish. 2. AT. varicgatus 



a. Flowers 3 cm. in diam. or less ; stigma 6-10-rayed, red ; fruit naked at base ; leaves 



3.5-10 cm. long, thinner, the basal lobes nearly as long as the body ; sinus deep 



and narrow, usually closed. 3. N. microphyllns 



1. N. advena (Ait.) Fernald. (See Rhodora 21:183. 1919. Naphar advena and 

 Nymphaea advena of many authors.) Cow Lily. Spatterdock. Yellow Pond 

 Lily. 



Swales and marshes, in rich bottom-land soils, also in marly situations ; frequent. 

 June-Aug. 



About the larger marshes of the basin, and along streams : Slaterville Swamp ; 

 near the mouth of Fall Creek, and by the Ithaca fair grounds; back of Stewart 

 Park ; Cayuga Marshes ; Vandemark Pond. 



N. Y. to Wis., southw. to N. C, Ky., Mo., and Kans., including the Coastal Plain 

 but not characteristic of that region. 



