FARWELL ON THE FLORA OF DETROIT. 35 



FAMILY 4. NAIADACE.-E. Naiad or Water Nymph Family. 



4. NATAS, Lin. 



15. liexilis (Willd.) Rosk & Sehmidth. 



Either slender and distantly branched, a foot or more long, or short 

 (two or three inches) and bushy, rigid. Common on sandy shores of 

 Belle Isle in shallow places. 



FAMILY 5. ALISMACE.E. Water Plantain Family. 



5. ALISMA, Lin. 



It). Plantago aquatica, Lin., var. trivialis (Ph.) 



A. trivialis Ph. Fl. Am. Sept. 1, 252: 1814. 



Leaves ovate or oval, large (5-G inches long), obtuse, cordate, 7-9 

 nerved. The American plant differs from the European in having 

 longer, more slender pedicles and in having smaller flowers, which 

 are white instead of pale rose. 



Old race-course. Frequent. 



17. var. parviflora (Ph.) 



A. parvifloraFh. Fl. Am. Sept. 1, 253: 1814. 



Leaves and flowers smaller; leaves abrubtly acutish, 3-5 nerved, sub- 

 cordate or obtuse at base. Vic. Linden Park. Frequent. 



6. SAGITTARIA. Lin. Arrowhead. 



18. arifolia, Nutt. Belle Isle canals. Common. 



19. sagittsefolia, Lin., forma latifolia (Willd.) Britt. Belle Isle. Common, 



20. forma obtusa (Willd.) Britt. Belle Isle. Rare. 



21. forma hastata (Ph.) Britt. Belle Isle. Frequent. 



22. forma diversifolia (Engelm.) Britt. Belle Isle. Rare. 



23. forma augustifolia (Engelm.) Britt. Belle Isle. Rare. 



24. rigidia, Ph. In canals on Belle Isle. Common. 



25. var. Engelmanni. 



8. heterophylla var. augustifolia Engelm, in A. Gr. Man. Ed. 5, 494: 

 1867. Not <S'. augustifolia, Lindl. River shores of Belle Isle. Com- 

 mon. 



26. graminea, Mx. Shores of Belle Isle. Rare. 



FAMILY 6. VALLISNERIACE^. Tape Grass Family. 



7. VALLISNERIA. Lin. Tape Grass. 



27. spiralis, Lin. Eel Grass. Belle Isle canals. Frequent. 



8. PHILOTRIA, Raf. 



28. Canadensis (Mx.) Britt. Water Thyme. Common in Detroit River, 



Order 3. Graminales. 



FAMILY 7. GRAMINE.E. Grass Family. 



9. ANDROPOGON. Lin. Beard-grass. 



29. furcatus, Muhl. Linden Park. Rare. 



10. CHRYSOPOGON. Trin. 



30. avenaceous (Mx.) Benth. Indian Grass. Linden Park. Rare. 



11. SORGHUM. Moench. Broom corn. 



31. Sorghum (Lin.) Karst. Johnson-grass. Ballast grounds, Detroit, 



Frequent. 



12. PASPALUM, Lin. Joint grass. 



32. setaceum, Mx. Linden Park. Common. 



