66 NEW YORK STATE MUSEUM 



RUYSCHIANA Miller, Gard. Diet. 4th Abr. Ed., 1754. 



Moldavica (Tourn.) L. (1735); Adans. Fam. PI., 2: 190. 1763 

 Zornia Moench, Meth. 410, 1794, in part. Not Zornia J. F. Gmel. 

 Dracocephalum Benth. Lab. Gen. & Sp. 490. 1832-36. Not L. 



Doctor Britton takes up Adanson's name for this group of 

 the mint family, which is distinguished from the true Draco- 

 cephalum of Linnaeus (Physostegia Benth.) by the 

 posterior (upper) pair of stamens being longer than the anterior 

 ones, while in Dracocephalum the posterior pair of 

 stamens is shorter than the anterior pair. In Ruyschiana 

 the calyx is two-lipped, while in Dracocephalum the 

 calyx is nearly or quite equally five-toothed or five-lobed, a com- 

 bination of characters which in this family is of considerable 

 importance and which places Ruyschiana (M o 1 d a v i c a) 

 in a separate subdivision of the family. 



Ruyschiana contains about thirty species, mostly 

 natives of Europe and western Asia, with a single species in 

 North America. The species fall naturally into five sections. 

 The type of Moldavica Adans. is Dracocephalum 

 Moldavica L., while the type of Ruyschiana is 

 Dracocephalum Ruyschiana L., which belongs to a 

 section which differs from the other four sections of the genus 

 mainly in having the anthers villous. 



Dracocephalum virginianum L. is quite clearly 

 the type of the genus Dracocephalum, not only in the 

 treatment by Linnaeus, but in pre-Linnaean literature. 



Ruyschiana parviflora (Nutt.) comb. nov. 



Dracocephalum parif lorum Nutt. Gen. 2: 35. 1818 

 ? D. nervosum Raf . Fl. Ludov. 43. 1817 



Moldavica parviflora Britton, in Britton & Brown, Illus. Fl. Ed. 

 2, 3: 114. 1913 



This is the only member of the section Cryptodracon (Benth.) 



comb. nov. (Dracocephalum, Sect. Cryptodracon 



Benth.) 



The principal Eurasian species are as .follows: 



Sect. 1. Keimodracon (Benth.) 



Ruyschiana pinna ta (L.) comb. nov. 

 Dracocephalum pinnatum L. Sp. Fl. 594. 1753. 



Ruyschiana discolor (Bunge) comb. nov. 

 Dracocephalum discolor Bunge; Verz. Suppl. Fl. Alt. 51. 1836 

 D. origanoides Ledeb. Fl. Alt., 2: 383. 1830. Not Steph. 



Ruyschiana palmata (Steph.) comb. nov. 

 Dracocephalum palmtaum Steph. ; Willd. Sp. PI., 3: "151. 1800 



