Equisetum. equisetace^ 741 



qiiatuor filirorniibus apice spatliulalis in cruceni dispositis circa spo- 

 ram spiraliter convolutis siccitale elastico resilientibus instructte. 

 — Planlce perennes terrestres vel aqualicfe. 



EQIISETUM (L. Gen. 1169). 



Character ordinis. 



Sect. I. VKRNALIA A. Br. — Caules dimorplii, fertiles pnecoces 

 siniplioissimi teneri decolores sporis elapsis marcescen- 

 tes et evanidi, steriles seriores ramosi iestatem perdu- 

 rantes. 



1. E. arvense (L. Sp. 15161 caulium l"erlilium vaginis turbi- 

 nato-tubulosis superne scariosis in 8-1 dentes lanceolatos acutos 

 herbaceos plus minus coluerentes fissis, spica oblusd. caulium ste- 

 rilium vaginis quadridentatis, ramis quadrangularibus siiuplicibus 

 vel ramulosis %. lc. Schk. 167.— Fl. Dan. t 1942 et 2001. 



Ilab. in pratis frigidis liuiuidis et agris limosis praeserlini in regionibus 

 septentrionalibu.s ditionis, Grtecia (ex Sibtti.), Arnienia Turcica (GallKy!), 

 Poutus Lazicus ad Djimil (Bal!), Caucasus et Transcaucasia (Ledeb.). 



Adest saepe forma serotina. 



Ar. Geogr, Europa tota sed in australioribus rarius, Sibiria, Jajionia, regio 

 Himalaloa, America borealis. 



2. E. Telmateia (Ehrh. Beilr. !2, p. 159) caulium fertilinni 

 vaginis turbinato-tubulosis superne scariosis in 30 dentes subulato- 

 setaceos fissis, spica crassa obtusa, caulium sterilium elatorum vagi- 

 nis quadridentalis, ramis octangularibiis gracilibns elongatis simplici- 

 bus 2i. lc. Engl. bot. 2022. — Schk. 168. — E. jlaimUUe Sm. non 

 L. — E. eburneum Roth. 



Hab. in umbrosis humidis, Grfecia (Bory), Macedonia, Thracia et Bithynia 

 (Griseb.), Tauria, Caucasus et Transcaucasia (Ledeb.), Cyprus (Ky), Syria 

 borealis in monte Aniano (Ky!), in Libano (Bl! Guill!), Persia ^.Milde). 



Ar. Geogr. Europa niedia et australis ab Anglia et Dania ad Rossiam me- 

 diam, Africa borealis, insuke Portunatse. 



Sect. IL SUBVERNALIA A. Br.— Caules dimorphi, fertiles coetanes 

 albido-rubelli, fruclificationis tempore simplices vel ramis 

 brevissimis inslrucli, demum spica cum ejus pedunculo 

 emarcida ramosi et cum caulibus sterilibus cestatem per- 

 duranles. 



8. E. sylvaticum (L. Sp. 15 15) ramis crebre verticillatis 

 arcuato-nutantibus telragonis verticillatim ranuilosis ranuilis trique- 



