C. H. Ostenfeld: Contributions to West Australian Botany. II. 63 



spicis junioribus margine scarioso leviter bifido, in spicis maturis 

 lineis depressis leviter curvatis limitatis, curvaturis binis super- 

 ioribus convexis oppositis in dentibus minutis productis. 



Flores terni immersi articulo superiori arcte adhaerentes, 

 perianthio superne dilatato edentulo, stamine uno anthera ad 

 medium lobata, perioarpio indurato brunneo ovato-lanceolato, 

 semine uno radicula infera albumine laterali (Fig. 24 a — d). 



This species distinguishes itself from the preceding by the 

 following characters: The stem bearing ripe spikes has as a rule 

 lost its assimilatory tissue, the spikes are smaller, and the rings 

 between the articles bear small acumens, the shape of the ripe 

 pericarp is different, and the style is persistent. It may be that 

 this is the true .4. leiostachyum. The two species were collected 

 in the same place and at the same time; Dr. Ostenfeld took 

 them for the same species. He remarks that A. Benthami forms 

 coarse flat cushions. On the other hand, a Berlin specimen is 

 labelled: about 3 /i m high. Dr. Ostenfeld has observed that broken 

 off spikes of this and the foregoing species are carried by the 

 wind, and thus sow out the seeds. 



Point Samson (Cossack), outskirts of Mangrove (No. 1143, 

 2. Nov. 1914); PortHedland, dune depression (No. 1144, 3. Nov. 

 1914). In the Berlin herb, the species is present from: Carnarvon 

 (L. Diels, No. 3739), and South Austr., Port Adelaide, leg. J. G. 0. 

 Tepper. 



23. A. (?) bidens Nees ab Esenbeck, in Lehm. PI. Preissianae 

 I (1845) 632; Moq. in D. C. Prodr. XIII 2 (1849) 151; Salicornia 

 bidens Benth. Fl. Austr. V (1870) 203. 



A sterile specimen only. It has been named on account of 

 its relatively long and distinct foliar scales. Fruit and seed are 

 not known, and thus it remains doubtful to which genus our 

 species belong. — Preiss' original specimen was also from Swan 

 River. 



Swan River at Perth (No. 340 A, 6. Sept. 1914, E. Dorph- 

 Petersen). 



24. A. (?) pruinosum n. sp. (PI. VI, fig. 3). 



Erectum fruticosum ramosissimum ramis oppositis ramulorum 

 articulis pruinoso-glaucis 1 cm brevioribus apice scarioso-dilatatis, 

 lobis 2 oppositis quam collo laterali paullo majoribus acutatis vel 

 angulatis. Spicæ 1 — 3.5 cm longæ 8 — 17 articulatæ articulis 

 brevibus superne scarioso-dilatatis margine fere annularibus. Flores 



