C. H. Ostenfeld: Contributions to West Australian Botany. II. 39 



1. Fruit 3 — 7 mm long, with rather large basal spurs. 



T. calcitrapa. 



2. Fruit about 15 mm long, basal spurs comparatively small. 



T. Stowardii. 

 ß. Fruit pyramidal with a conical apex, 3.5 — 4 mm long; basal 



spurs not incurved T. turrifera. 



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; car- 

 pels with slightly dilated base and very short, but mostly 

 distinct basal spurs T. centrocarpa. 



2. Fruit linear, 1 — -1.5 mm long; carpels faith hardly any dilation 

 at the base and no spurs T. minutissima. 



ß. 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 

 port; no basal spurs F. Muelleri. 



II. Crassula L., emend. Schönl. 



(Sect. Tillæoidea Schönl.). 



I think the authors who include Tillæa in the genus Cras- 

 sula are right, and I follow in this respect Schönland in his 

 treatment of the genus in Engler u. Prantl, Natürl. Pflanzenfam. 

 (Crassulaceæ, 1891) and in his recent monograph of the South- 

 African species of the section Tillæoidea (Ann. Bolus Herb. II, 

 2, 1916). 



I have found it necessary to restore two of Nees ab Esen- 

 beck's species and to create a new one. Some of the species I 

 have had in culture from seeds taken from herbarium specimens 

 kindly sent by Mrs. M. Davis of Perth, and they have kept their 

 characters very well under cultivation. 



In the following key I have given the distinction marks for 

 all the species hitherto recorded for W. A. 



A Key to the W. Australian Species of Crassula. 

 A. Flowers axillary in dense few- to several-flowered clusters (rarely soli- 

 tary in the axils and then sessile), forming spike-like inflorescences, 5- 

 (rarely 4-) merous; seeds two in each carpel. 



a. Carpels broad, short, obtuse with medium-long style, much shorter 

 than the calyx; at least some flowers on pedicels longer than the 

 calyx C. Miriamæ. 



b. Carpels long, oblique ovate, acute with a long style; flowers sessile 

 or very shortly stalked. 



