90 
Brachythecium denticulatum, Linn.—B. rivulare, Bruch.—B. colli- 
num, Schp.—B. collinum, var.—B. Utahense, James.—B. Fend- 
leri, Sulliy. 
Eurynchium strigosum, Hoffm.—E. diversifolium, Rr. Eu. 
Amblystegium confervoides, Schwaegr.—A. minutisgmum, 8, & L.— 
A. serpens, Linn,—A. orthocladon, Beauv.—A. radicale, Brid.— 
A. compactum, C. Miill. 
Sterodon plicatile, Mitt. 
Limnobium palustre, Br. Eu. 
Hypnum filicinum, Linn.—H. uncinatum, Hedw.—H. reptile, Mx., 
var.—H. curvifolium, Hedw. 
HEPATIC. 
Marchantia polymorpha, Linn. 
Jungermannia pumila, With.—J. tricophylla, Linn. 
Scapania compacta, Linn. 
Reboulia hemisphaerica, Rad. 
§ 93. Acanthospermum xanthoides and Clerodendron Siph- 
onanthus.—It would be well if the date of the appearance of intro- 
duced plants were recorded, and the history of their advents made 
out before they became widely disseminated, and I was glad to see 
Prof. Wood make mention of the above-named plants in the March | 
No. of the Butterin. In regard to these plants he has been misin- 
formed ; one would infer from his notes that Acanthospermum 
was first detected last summer, and that the Cleredendron, though 
known for several years past, was now first determined. Having 
known both plants for several years, it is proper that the record as 
to these points should be modified I saw Acanthospermum grow- 
ing abundantly in the Southern States over four years ago, and 
had previous to that time received specimens from Mr, P. J. Berck- 
mans, who lives a few miles from Augusta, Ga. Having named the 
Clerodendron for him several years ago, I wrote to Mr. Berckmans 
asking him for the history of both plants. Though actively en- 
gaged in the nursery business, Mr. B. is interested in, and an accurate 
observer of native plants, and all others that he meets with, and 
we are indebted to him for the knowledge of localities for several 
choice Southern species, especially for a new locality for the rare 
and unfruitful H7/iottia, as recorded in the BULLETIN a few years ago. 
In reply to my inquiries, Mr, Berckmans writes : 
Acanthospermum xanthoides.—About the year 1851 the then 
existing factory of Belleville, a few miles from Augusta, received a 
quantity of wool imported from Buenos Ayres. This wool was 
found to contain great numbers of small burs, which were separated 
by the picking machine, and the “trash” was thrown outside of the 
picker room. The following year there sprang up innumerable 
plants of a spreading habit, which covered the ground all around 
the factory, and in a very few years the surrounding country was 
filled with the plant. The hooks upon the involucre allow the heads, 
or burs, to attach themselves to the legs of cattle, and in this way 
the seeds are carried about and widely scattered. 
