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 Hneolata he substitutes the 

 words transverse reticulata, which is correct in itself and was 

 used by me p. 431 and p. 432, 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. 



Fag. 432. J. brachycarpus, oxi/meris and falcatus ought 

 to be classed under I. 2. For "J. rudis" read J. microcepha- 

 lus. J. dubius comes under I. 3. J. aciitus 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. 435. 27. J. repens was inadvertently classed with 

 the 6-androus species. The Glomerxdifiori would be better 

 arranged thus: 



* Triandri. (No. 26 b. & c. saspius uniflori ; No. 30, 8-6-andrus.) 



J. Kelloggii, n. sp. California. 



J. triformis, n. sp. California. 



J. repens, Michx. 



J. marginatus, Kostk. 



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. 



