Floristik, Geographie, etc. — Pharmaceutisches, etc. 367 



Ciirtissii, I. Robinsonii, and /. lanbraticola , all attributable to the 

 author unless otherwise noted. ' Trelease. 



Holm, T., Medicinal plants of North America. 15. Hedeoma 

 pidegioides Pers. (Merck's Report. 17. p. 115—117. f. 1—12. May 1908.) 



The drug "■ Hedeoma'^ is the dried leaves and flowering tops of 

 H. pidegioides Pers., the so called Penny royal, which is an inhabi- 

 tant of open woods and dry hüls from Canada to Iowa and south- 

 ward. The internal structure is described, and , the following charac- 

 ters may be mentioned. There is no collenchyma in the hypocotyl, 

 the phellogen appears in the innermost layer of the cortex, thus 

 bordering on endodermis, in the Labiatae the cork is known to 

 develop in different places of the cortex, for instance in the peri- 

 pheral Stratum, just inside epidermis {Coleiis, Stachys etc.), or in the 

 middle of the cortex, as in Phloniis; in Hyssopits officiualis Briquet 

 observed that the cork became formed just outside endodermis, as 

 in Hedeoina. No stereomatic pericycle was observed in the hypo- 

 cotyl. In the internodes above there is hypodermal collenchyma and 

 an endodermis, but no stereome. The stele contains four broad 

 Strands of mestome with interlying narrow and short rays of inter- 

 fascicular cambium, from which some Strands of leptome and several 

 strata of thickwalled mestome-parenchyma become developed. The 

 leaves show a dorsiventral structure, and the stomata have one pair 

 of subsidiary cells vertical on the Stoma; three t5^pes of hairs occur 

 on the dorsal face of the blade: "curved and printed, consisting of 

 one to three cells in a Single row," covered by a wrinkled cuticle; 

 the two other kinds are glandulär, of which the one is very small, 

 two-celled, the other one being large, bladder-like with the head 

 divided into eight cells, producing transluceni; dots on the leaves 

 when held toward the light. The mestome-strands of the leaves are 

 collateral, and surrounded by thinwalled parenchyma-sheats. The 

 petiole contains a Single broad mestome-strand surrounded by thin- 

 walled parenchyma and hypodermal collenchyma. Theo Holm. 



Holm, T., Medicinal plants of North America. 16. Medeola 

 Vivginiana L. (Merck's Report. 17. p. 147—148. f. 1—2. June 1908.) 



The tuberous rhizome is the part used, and although the plant 

 has been known as a medicinal herb for many years, it has not, 

 so far, been considered as being of much importance. The rhizome 

 consists of a large, horizontal tuber of two to three distinct inter- 

 nodes with scale-like leaves, and one or two, but mostly only one 

 stolon, the apex of which soon attains the size and structure of the 

 mother-tuber. The slender roots are snowwhite like the tuber, and 

 develop from all sides of this; they are not contractile and repre- 

 sent simply nutritive roots. The stem above ground is terminal, 

 being developed from the apex of the tuber, while the stolon is 

 axillary, thus the ramification is sympodial. The basal portion of the 

 stem above ground bears some small, tubulär leaves, which support 

 small buds, which remain dormant, however, under normal condi- 

 tions. But when the mother shoot becomes injured, these buds grow 

 out as vegetative shoots. The subterranean stem has no stereome 

 and no endodermis, but a few layers of thinwalled collenchyma on 

 the leptome-side of the mestome-strands, which are here arranged 

 in a circular band, around the very broad pith. In the aerial stem. 



