ENGELMANN—NORTH AM. SPECIES OF JUNCUS. 489 
I. 1). In the third class these cells are narrow and much elon- 
gated, sometimes as long as the seed itself, and their thick 
walls form the ribs of these seeds. 
Dr, F. Buchenau, the acute observer of the Junci, has pub- 
lished the results of his observations on the seeds of the Ger- 
man species in Botanische Zeitung 25, p. 201 (June 25, 1867). 
He generally coincides with my views; but a new term for 
the crossbars of the reticulated seeds, transtilla, seems to him 
necessary, and for my semina lineolata he substitutes the 
words transverse reticulata, which is correct in itself and was 
used by me p. 431 and p. 482, II. 1. but does not seem to me 
to express the predominant character of these seeds as well as 
the former term. He also minutely describes the color of the 
seeds, a character which I have occasionally mentioned, but 
which seems to be in most species too slight, and even vary- 
ing, to give it much importance. 
Pag. 432. J. brachycarpus, oxymeris and falcatus ought 
to be classed under I. 2. For “J. rudis” read J. microcepha- 
lus. J. dubius comes under I. 3. J. acutus belongs rather be- 
tween I. 1 and I. 2,and J. Kelloggii near J. marginatus, III. 
1. J. longistylis together with J. obtusatus may be properly 
classed under I. 2. The apparent necessity of these numerous 
changes is a proof of the difficulty of properly classing the 
seeds; only completely ripe and well developed seeds ought 
to be used for these investigations. 
Pag. 433. It ought to have been stated that in the sys- 
tematic arrangement all the species not expressly marked as 
belonging to 3-androus sections, are 6-androus. 
Add: 5. b. J. Lesueurii for subsp. Pacificus. 
Pag. 434. 10. J. Smithii comes under 1. Aphylli. 
Pag. 455, 27. J. repens was inadvertently classed with 
the 6-androus species. The Glomeruliflori would be better 
arranged thus: 
* Triandri. (No. 26 b. & c. sepius uniflori; No. 30, 3-6-andrus.) 
J. Kelloggit, n. sp. California. 
J. triformis, n. sp. California. 
J. repens, Michx. 
J. marginatus, Rostk. 
J. leptocaulis, Torr. & Gr. 
* * Hexandri. 
J. falcatus, Mey. 
J. obtusatus, n. sp. California, 
J. longistylis, Torr. 
The other changes, necessary on this and the following 
page, the reader will please make for himself, following the 
text from p. 459 onward. 
Pag. 438. J. acutus. The specimens said to come from 
New Jersey are from Z. Collins’ herbarium, and are, as Mr. 
