1886.] BOTANICAL GAZETTE, 309 
than strengthening cells: ducts (.030-.060 mm.) sometimes want- 
i eaves 1 in g. 
In the northern States. 
30. P. pungens Michx. may be looked for here. 
* * Ducts always internal: bundle-sheath thin-walled. 
37. P. palustris Miller. Cells of thin-walled layer generally 
much smaller than those of the epider mis : strengthening cells 
mostly on ventral side of fibro-vascular region : ducts variable in 
size (.040-.050 mm.), with few strengthening cells: leaves 10-15 
in. long. 
P, australis Mx. 
Virginia to Texas. 
38. P. Cubensis Griseb. Cells of thin- aes layer large, 
often equalling those of the epidermis: strengthening cells about 
as largeas epidermal, mostly but one layer ; soinetabe more in 
the angles, and even extending to the ducts ; none about the ducts 
nor in dhe a 3 ion: duets variable in size (.050- 
080 mm.), often with dteeniory parenchymatous ones: fibro- 
vaciihiee’ bundles but little separated, often blended: leaves 7- 
in. 
P. Eltiottii Engelm 
South Carolina ee Florida. 
Nore.—We would be pleased to receive from our friends specimens for 
ienopeasti, as doubtless a wider range of forms will lead to some modifica- 
s. 
BRIEFER ARTICLES. 
A ease of teratology.—It is not always that the continuity of the leaf- 
spiral can be readily demonstrated with opposite or whorled leaves. Tera- 
A stem of the garden valerian, Valeriana 
al 
of the stem were nearly horizontal the leaf-spiral was neerly pease and the 
leaves were inserted vertically with their buds at the side. wisting, as 
common with monstrous formations of the stem, was confined to i single axis. 
A 
Beverly, Mass., which were attacked by the tru 
mon in many parts of Europe. In all respects the leaves attacked resemble 
