BY J. H. MAIDEN AND E. BETCIIE. 021 



SCHEUCHZERIACEJE. 



The germs Triglochin is placed by Beiithain and Hooker in the 

 very heterogeneous order ISTaiadacej^?, whicli contains plants of 

 such different structure that they have hardly anything in common 

 but their aquatic habit. In accordance with the nomenclature 

 followed in Engler's ' Nat. Pflanzenfamilien,' the artificial order 

 Naiadace?e has been split into several smaller natural orders, 

 viz. : — Potamogetonace^e, Najadaceai and Juncaginacea?, the genus 

 Triglochin belonging to the last-named order. In Fr. Buchenau's 

 latest Monograph in Engler's 'Ptlanzenreich" (1903), the name 

 of the order Juncaginacetie has been changed into Scheuchzeriacese, 

 and so many changes have been made in restoring old names to 

 specific rank (merged by Benthara and Mueller into other species), 

 that it will be of interest to Australian botanists if we give here 

 a short extract of Prof. Buchenau's views on the Australian 

 Scheuchzeriace?e. 



Key to the Australian Genera of Scheuchzeriace.e. 



1. Ovule erect 1. Trigloclnn, hmn, 



1*. Ovule pendulous 2. Maundia, F.y.M. 



Key to the Australian Species of Triglochin. 



i. Subgenus Eutriglocliin; carpels connate, separating at maturity from the 

 central axis, the apices sometimes free. Fertile carpels 3 in the Aus- 

 tralian species. 

 1. Perennial plants with persistent stolons. Carpels semicircular, obtuse at 

 the base. 1. T. striata, Ruiz, et Pav., Fl. Peru v. et Chil. iii. (1802) 72; 

 B.Fl. Austr. vii. 166. — All the Colonies except West Australia. 

 l^. Small annual plants, 



2. Carpels free at the apex, the fertile ones with a reflexed point at the 

 apex. 2. T. mucronata, R.Br., Prod. (1810) 343; B.Fl. Austr. vii. 

 168.— W. A., S.A., Vie. 

 2*. Carpels straight, connate to the apex. 



.3. Fruits elliptical, very small (hardly 2 mm. long), carpels rounded 

 at the base and at one back. 3, T. Bhielleri, Buch., Ptlanzen- 

 reich iv. 14 (1903), p. 12.— W. A. 

 3*. Fruits linear, carpels more or less spurred at the base. 



