149 



briatis. — Repeatedly dichotomous from the annual root, divari- 

 cate-diffuse, a sessile and solitary involucrum in each fork ; on the 

 branchlets the involucres rather crowded and somewhat spicate 

 or panicled, through the less forking and the gradual reduction of 

 the leaves to bracts. Radical leaves spatulate. The cauline 

 leaves are larger, less lobed, more amplexicaul, (and most of 

 them really perfoliate,) and the angles or lobes less awn-pointed 

 than in G. {Mucronea, Benth.) Oalifornica ; the four triangular 

 teeth of the involucre also tipped with a shorter awn, not exceed- 

 ing the perigonium when that is fully developed ; the divisions of 

 the latter, especially the three inner ones, conspicuously fimbri- 

 ate-laciniate. Otherwise this plant closely resembles Bentham's 

 Mucronea Californica, and confirms his doubts of the distinctness 

 of the genus from Chorizanthe, notwithstanding the peculiarity of 

 habit. Centrostegia, with a similar habit, is distinguishable only 

 by the spurred appendages of the involucrum, and is probably to 

 be reduced, along with Mucronea, to a section of Chorizanthe, 

 To this, however, does not belong Remy's C. commissuralis, which 

 diflfers from true Chorizanthe merely in the laxer inflorescence. 

 Acanthogoniim, Torr. (which has a short-pedicelled flower and 

 nine stamens,) is an interesting link, plainly connecting Lastar- 

 7'icea, Remy, with the other Eriogoneous genera. The verticil- 

 late upper leaves of the latter answer to the involucre, which, 

 however, incloses a proliferous shoot as well as a flower. 



109. Anemonopsis Califoi-nica, Nutt. 117. Calochortus venustus, Benth. 



110. Euphorbia albomarginata, Torr. 118. Juncus xiphioides, E. Ifeyer. 



(E. stipulacea, Engelm.) 119. Polypogon Monspeliensis, Linn. 



111. Quercus lobata, iVe'e, (Q. Hindsii, 120. Triticum repens, Linn. 



Benth.) Foliage only. 121. Elymus dasystachys, Trin. ex 



112. Ephedra antisyphilitica, Berl. Alunro in PI. Hartio.^ p. 342, 



113. Epipactis Americana, Lindl. (= forma luxurians, Eariw. No. 



114. Brodigea capitata, 5e?ii/t. 2032.) 



115. Calliproa lutea, Lindl. 122. Allosorus andromed£efolius, Kaulf. 



116. Tritelia laxa, Lindl. 



Dr. C. T. Jackson announced that the wax-plant of 

 Japan [Rhus succedaneum) had been made to vegetate 

 at the forcing houses in Washington ; it grows there vig- 

 orously, and will doubtless prove suitable for the South- 

 ern States generally. He also stated that the experiment 



