Geo. Engelmann, M.D. 



3003 Looust itreet. 



Dear Dootor 



Thanks for the beautiful plants. Pirat of all 

 for the Isoetes whlch I now oan better study from the numerous spec- 

 Imens« It is my I.Butlerl from the Indlan Territory, whi ah ls very 

 elosely related to the I.melanopoda but differs,beslde other eharaot- 

 ers, In the mach larger Maorospores, larger,blaoklsh,and very spinous 

 Mierospores,and In the absence of a velaaen. But the most lnteresting 

 polnt ls that I.Antlerl ls dloeolous;I have examlned probably 100 Spee- 

 les from the original habltat and deterralned thls faot» Among yours 

 I have found thus far only female ones;but the aore abundant materlal 

 permits me to deteralne also on your plant thls oharaoter, Other Iso- 

 etes are monoeoious f but melanopoda ls 1/3 male, 1/3 female, and 1/3 mon- 

 oeclousl Theref ore mldway between Butlerl and the other speoiea. I 

 would have llked to have had very muoh nore mftture speolmensj perhaps 

 you will collect some in later yearsjit seems that the plant occurs 

 on dlfferent habitats. Colleot abundandly of thls lnteresting plant 

 and try to get both sexes;thus 1t will happen that you lndlsorimlnately 

 will generally find equal quantltles of male 3 and female s» 



The Cusoutae are C.roatrata from the mountains and G.ohlorooarpa from 

 the Polygonum at Hashvllle. Your Polygalla Huttallll 1b rather P.san- 

 guinea,a form wlth narrower wings and amaller caruncula of the seeds. 

 Nuttallll ls dlfferent; 1t has mach amaller f lowers,eto« 



Your Plantago ls heterophy IIa (from many pltted seeds in the eapsule)* 

 I am enolosing P.pusllla, whlch has only 4 smooth seeds, 



I also enolose a of Arabls lyrata. Your plant is A.ludovio- 



lana« 



Sohoenollrlon was very welcome to me; so was Asplenium Bradleyi, whlch 



St* Louis, Mo., Nov 27 1881, 



