TRIURIDACEX.— BUTOMACE. 707 
Series 2. Supere. 
Sub-series 1. Apocarpe. 
Cohort 1. Triwrales.—Flowers unisexual. Perianth 6-lobed or 
6-partite. Stamens 6. Carpels l-ovuled. Seeds minute, 
with very dense albumen and rudimentary embryo. Minute, 
leafless, slender herbs. 
Order 1. Trruripace#, the Triuris Order.— Diagnosis.—This 
is a small order of plants allied to Naiadacez, but usually to be 
distinguished by its rudimentary embryo. The flowers are, 
also, sometimes perfect. 
Distribution, Numbers, and Properties.—Exclusively found 
in warm and tropical regions. Illustrative Genera :—Triuris, 
Miers; Sciaphila, Blume. There are 8 species. Their pro- 
perties and uses are unknown. 
Cohort 2. Potamales.—F lowers hermaphrodite or unisexual. 
Perianth with usually 6 segments, or rarely 2 or 4, or absent. 
Stamens 1, few, ornumerous. Seeds exalbuminous ; embryo 
conspicuous. Usually water plants. 
Order 1. ButomacE#, the Butomus Order.—Character.— 
Aquatic plants with parallel-veined leaves, sometimes milky. 
Flowers hermaphrodite (jig. 1066), showy. Perianth inferior, 
of six pieces, arranged in two whorls (fig. 1066), the inner being 
coloured. Stamens few (fig. 1066) or numerous. Carpels 3—6 
(fig. 593) or more, more or less distinct; ovaries superior (fig. 
1066) ; ovules numerous, ar- 
ranged all over the inner sur- Fie. 1066, Fig. 1067. 
face of the ovaries (fig. 636). 
Fruit many-seeded, separ- 
ating more or less when ripe 
into as many parts as there 
are component carpels. Seeds 
without albumen (jig. 1067). 
This order is included by 
Bentham and Hooker in Alis- 
macex., 
Distribution and Num- Fig. 1066. A flower of the Flowering Rush 
bers.—A_ few plants of this (Butomus umbellatus), with an inferior 
order occur in tropical coun- perianth arranged in two whorls, nine 
tries. but the greater number stamens, : and six carpels. Fig. 1067, 
; ? Vertical section of the seed of the same. 
inhabit the northern parts 
of the world. Illustrative Genera :—Butomus, Tourn. ; Lim- 
nocharis, H. et B. There are 7 species. 
Properties and Uses.— Of little importance. Butomus wmbel- 
latus, the Flowering Rush, possesses acrid and bitter properties, 
ZZ? 
