376 



Alfred J. Etvart 



Ostenfeld also gives a key to the annual species. Including the 

 perennial species, the following would be the key as modified 

 to include all the Australian species of Triglochin at present 

 recognized. 



ANNUALS. 

 I. — Fruits of three nutlets falling from a central axis. 



A. Carpels with free apex, the three fertile ones with a 



reflexed apical mucro ; fruit turbinate - - T. miicronata 



B. Carpels united up to apex, no apical mucio, fruit 



linear or pyramidal to ovoid. 



(a) Carpels Avith well developed, mostly incurved 

 basal spurs; fruit linear-pyramidal or pyramidal. 



(b) Fruit Unear-pyramidal, evenly tapering from base 

 towards apex ; basal spurs incurved. 



1. Fruit 7 mm. long, with rather large basal 



spurs - - - - - T. calcitrapa 



2. Fruit about 15 mm. long, basal spurs com- 



paratively small - • - - T. Stowardii 



Fruit pyramidal with conical apex, 3.5-4 mm. long ; basal 



spurs not incurved - - - - - T. turrifera 



<B) Carpels with very short or hardly any basal spurs; 

 fruit linear to elliptic or ovoid. 



(a) Fruit linear or linear-pyramidal. 



1. Fruit mostly linear-pyramidal, 2-4 (rarely 



5.5) mm. long; carpels with slightly dil- 

 ated base and very short, but mostly 

 distinct basal spurs - - - T. centrocarpa 



2. Fruit linear, 1-1.5 mm. long ; carpels with 



hardly any dilation at the base and no spurs T. mmutissima 

 Fruit oblong to elliptic or ovoid. 



1. Fruit oblong-ovoid, 2-2.5 mm. long, tapering 



into a conical apex very short, but distinct 



basal spurs - - - - - T. trichophora 



2. Fruit elliptic, about 2 mm. long, without 



any distinct apical part ; no basal spurs - F. Muelleri 



PERENNIALS. 



Plants 2 inches to a foot in height - - - - T. striata 



51. — Fruit of 3 to 6 nutlets not leaving a central axis or 

 sterile partitions. 



1. Flowers nearly sessile, carpels usually six - T. procera 



2. Flowers sessile, carpels usually two or three 2\ Maundii 



