NOTES ON OUR LOCAL PLANTS 43 



Hydrophace trisulca (Linn.) Bubani, Fl. Pyr. 4, p. 23, (1901). 



Lemna trisulca Linn. Sp. PI. p. 970, (1753), Lenticula 

 palustris of the pre-Linnaeans. Lenticula aquatica trisulca C. 

 Bauhin, Pin. p. 362, (1623) Hederula aquatica Lobelius, Ic. (1579) 

 Staurogeton trisulcus Schur. Verh. Siebenb. Ver. Naturw. IV, 

 p. 70, (1853). 



Very common on all stagnant ponds and pools that do not 

 dry up part of the season. Notre Dame, Ind. No. 10568, (St. 

 Joseph Co.) also South Bend, Mishawaka, Lakeville, Pine, Warwick 

 near the Michigan State boundary. Springbrook Park, Wharton 

 Lake, Dollar Lake and Chain Lakes. Hudson Lake, (Laporte Co.) 

 Michigan City. Tamarack and Smith (Porter Co.), Millers and 

 Dune Park (Lake Co.), also near Granger (Elkhart Co.), New 

 Buffalo, Michigan, Bertrand, Niles, St. Joseph, Benton Harbor, 

 Baroda, Stephens ville, (Berrien Co.), Bankson Lake and surround- 

 ing ponds (Cass Co.), Lake Maxinkuckee, (Marshall Co.) H. W. 

 Clarke. I have never been able to find it in bloom. 



Frequently when submerged it continues to grow vigorously 

 but fails to produce any roots for generations under these conditions. 

 This condition I have noticed for several years in specimens pre- 

 served in the laboratory. 



Hydrophace minor (Linn.) Bubani, do. 



Lemna MINOR Linn, do Lenticula aquatica Brunfels, Lenticula 

 palustris Tragus Lens palustris Camerarius Epit. 852 also Ray. 

 Angl. 3, p. 129, t. 4, f. I. 



Very common like the preceding. I have found it in bloom 

 at Notre Dame, along the L L I. R. R. in May, 1907. No. 10564, 

 but not since then. The flowers appeared from a cleft in the edge 

 of the thalloid shoot and consisted of one or two stamens, when 

 latter of different ages. The anthers were subglobular papillose 

 and pure white in color. The pistil is short styled and almost 

 completely embedded within the cleft and bractlike covering at 

 the base. Flowering specimens were not abundant, only one in 

 about 150 to 200 plants producing flowers. These were, however, 

 perfectly evident to the naked eye because of the whiteness of the 

 stamens. Collecting and separating out the following plants 

 was a very tedious operation. 



