1920] Mackenzie,—Purple-flowered Eupatoriums 159 
* EUPATORIUM foliis subverticillatis lanceolato-ovatis serratis 
petiolatis rugosis. 
* Eupatorium foliis verticillatis. Cold. noveb. 180. 
* Eupatorium foliis ovato-lanceolatis obtuse serratis in petiolos 
desinentibus. Gron. virg. 93. 
* Eupatorium enulae folio. Corn. canad. 72. t. 72 
* Eupatorium canadense elatius, longioribus foliis rugosis integris 
& caulibus ferrugineis. Morts. hist. 3. p. 97. s. 7. t. 13. f. 4. 
*6. Eupatorium foliis lanceolato-ovatis serratis petiolatis, caule 
erecto. Hort. cliff. 396. Roy. lugdb. 155. 
* Eupatorium novae angliae, urticae foliis. floribus purpurascen- 
tibus, caule maculato. Herm. par. 158. t. 158. Moris. hist. 3. p. 97. 
$.1.06 18. f. 3. Raj. suppl. 187. 
“ Habitat in America septentrionali. Y 
* Caulis teres, erectus, viridis, punctis linearibus longitudinalibus 
purpurascentibus. Folia terna, quaterna, s. sena, lato-lanceolata s. 
lanceolato-ovata, serrata, rugosa, scabriuscula, petiolata, utrinque 
viridia. Corymbus terminalis. Calyces florum incarnati. Flosculi 
octo, Corollis albidis, Antheris purpureis, stylis longissimis." 
Before taking up the diagnosis of Linnaeus let us consider in their 
order the citations from the older works given by him. 
1. Colden's description (not seen by Prof. Wiegand) calls for a 
very tall plant with leaves in sixes, sometimes in fours or fives, grow- 
ing *in humidis" and having light purple corollas. I would identify 
this with Species No. 3. 
2. Clayton's plant is described by Gronovius as having ovate- 
lanceolate leaves obtusely serrate tapering into the petiole. "This is 
identified by Prof. Wiegand as Species No. 3, and in this identifica- 
tion I agree. 
3. Cornut's description and plate is next cited by Linnaeus. The 
plate represents the complete plant and shows rather wide strongly 
serrate leaves in fours. It presumably came from Canada like the 
rest of Cornut’s plants. Prof. Wiegand identifies this plant with 
No. 3 because in the description Cornut says “caules rubescentes 
(cineres tamen colore suffusi) * * inanes intus,” although, as he states, 
Species No. 3 is not known in Canada. 
The plate is most certainly not one of Species No. 3, and I can see 
nothing in the words quoted from Cornut not applicable to the 
common Canadian plant No. 2. I would therefore identify this 
plant as Species No. 2. 
4. The next citation by Linnaeus is from Morrison. As stated by 
Prof. Wiegand his plate seems to have been copied from Cornut and 
