394 NATURAL HISTORY OF PLANTS. 
or denticulate, quite covered with glandular odorous aromatie points. 
The rachis and folioles are generally articulate. The flowers are 
axillary or terminal, sometimes solitary, sometimes in more or less 
ramified biparous cymes. 
Boronella, consisting of plants growing in New Caledonia, is dis- 
tinguished from Boronia by its decussate unequal sepals, its uni- 
ovulate ovaries, and almost erect orthotropous ovules. 
Zieria (figs. 424, 425), composed of Australian shrubs, is also 
nearly allied to Boronia, to 
which it has been even 
proposed that it should be 
united, the only difference 
being in its four alternipe- 
talous stamens, lined within 
their base by a larger or 
smaller gland. Zeridium, 
with its uniovulate ovaries and suborthotropous ovules, is to Zeria 
what Boronella is to Boronia. Acradenia consists of species of Bo- 
ronia, with 4—8-merous flowers, imbricated petals, and ovaries con- 
taining two collateral ovules capped by an obturator. In a secondary 
group of Hriostemonee, the leaves are alternate and simple. 
The genus Zrioslemon (figs. 426-428) itself has 4—5-merous 
flowers, an imbricated, rarely subvalvate co- 
rolla, and a diplostemous androceum, the eight 
or ten stamens having anthers more or less 
long-apiculate. Aicrocybe only differs from 
it by an often incomplete calyx, represented by 
leaves varying in number from one to five. 
The corolla is pentamerous and imbricated ; 
the androceum formed of ten stamens longer 
Zieria Smithii. 

F1G. 425. 
Long. sect. of flower. 
Fie. 424. 
Flower (2). 
Eriostemon (Crowea) 
salignum. 

Fira, 426. 
ee than the petals, and the gynæceum composed 
of only two carpels. It has flowers grouped in 
capitules. In Ge/eznovia also with alternate leaves, 4—5-merous, 
flowers may be observed constructed like those of Boronia; but the 

Reg. (1841), sub n. 47,—A. CUNN., in. Field 
N. S.-Wal., 330,—Anvr., Bot. Repos., t. 606. 
—Hoox., Icon., t. 722, —Enpu., Nov. Stirp. 
Dec., 6; in Hueg. Enum., 16.—Ners, in Pl, 
Preiss., ii. 227. — Barrt. in Pl. Preiss., i. 
166. —Turcz., in Bull.» Mose. (1852), ii. 
160.— F. Muezx., in Hook. Kew Journ., 
viii. 88; Fl. Vict., i. 109; Fragm., i. 3, 66, 
98; ii. 97, 177, 179, 180; iv. 28, 135, 172.— 
Bentu., F/. Austral., i. 307.—A. Gray, Unit. 
St. Expl. Exp., Bot.,i.330.— Bot, Mag., t.1763, 
4052.—W axp., Rep.,i. 502,503 (Cyanothamnus); 
v. 388; Ann., ii. 247; iv. 411; vii. 516. 
