180 FERGUSON: CONTRIBUTIONS TO FLORA OF LONG ISLAND 
characters. So late a publication as ‘Flora of the District of 
Columbia’’, Contributions from the National Herbarium at 
Washington, 1919, separates the above two species (?) by leaf 
form. As to localities, in a general way all of the above authori- 
ties place S. Engelmanniana north of New Jersey and S. longi- 
rostra, New Jersey and south, with but few exceptions. 
In Torreya, February, 1909, Mr. K. K. Mackenzie as a result 
of field observation states that as described in the manuals S. 
Engelmanniana and S. longirosira are but different forms of the 
same species, the leai form having no diagnostic value. 
In Flora of Nantucket, Bulletin of the Torrey Botanical 
Club, Mr. E. P. Bicknell describes the Nantucket plant as 
Sagittaria Engelmanniana J. G. Smith with lamina of blades 
varying from linear to ovate, from I mm. to 4 cm. wide. 
In Plants of Southern New Jersey, Dr. Witmer Stone de- 
scribes as the common arrowhead of the Pine Barrens Sagitiaria 
longirostra (Micheli) J. G. Smith with a very variable leaf form 
narrowly linear to broadly hastate and states that the narrow 
leaved form of the Pine Barren plants was long confused with 
S. Engelmanniana, a more northern species. 
At a time when the writer was much perplexed over this 
subject he found in a Pine Barren swamp at Ronkonkoma two 
colonies of Sagitiarta one-quarter of a mile apart, one colony 
growing in the open with linear sagittate leaves and one colony in 
shady thickets with ovate sagittate leaves. They were undoubt- 
edly the same species, but which; Engelmanniana or longi- 
rosira? Specimens of both forms were sent to Dr. Witmer Stone 
who identified them as the same as the New Jersey Pine Barren 
plant described as S. longirostra (Micheli) J. G. Smith in Plants 
of Southern New Jersey. Dr. Stone wrote that the researches 
of Mr. Bayard Long had caused them to now name this plant 
S. Engelmanniana J. G. Smith. 
Specimens from the same colonies weie also sent to Mr. 
Eugene P. Bicknell, who identified them as the same as his 
Nantucket plants, S. Engelmanniana. Mr. Bicknell wrote as 
follows: “I should call these plants S. Engelmanntana believing 
at the same time that this name will be a synonym of S. longi- 
rostra with variations named as forms if one wants to do hair- 
splitting. The winging of the fruit varies with the width of the 
leaves. In a swamp now filled in at Lynbrook was a plant 7.5 
