Wolfjia. | LEMNACEX (Brown). 41 
rather dark green; fluwers very rare. W. arrhiza, Wimm. FI. 
Schles. ed. 3. 140; Journ. Bot. 1865, 118, ¢. 29; Hegelmaier, 
Monog. Lemn.124. Lemna arrhiza, Linn. Mant. alt, 294. 
_Katanwari Reeion: Transvaal; Hooge Veld at Standarton, Rehmann, 
6777 ! 
Widely distributed in Europe, Asia, and Africa. 
2. W. denticulata (Hegelmaier, Monog. Lemn. 133, t. 3, f. 16- 23) ; 
frond 2-22 lin, long, + lin. broad, es ‘minutely toothed at the end ; 
young fronds sessile ; “flowers unknow. 
South Arrica: Krauss. 
T have not seen sear spe ots According to Hegelmaier it was collected by 
Krauss with Lemna 
Orper CXLVII. NAIADACEZ. 
(By ARTHUR BENNETT.) 
Flowers aes green (often coloured in Aponogeton), 1—2-sexual. 
Perianth 0, or tubular, or of 3-4, inferior, valvate segments, Stamens 
hypogynous Oe ti l- 2-celled, Ovary of 1-4, l-ovuled carpels; 
style long or short ; stigma of many forms. Jruit of 1-seeded 
utricules, ‘iehea, or drupelets. Seed exalbuminous ; embryo curved, 
or ic large at re radicular end. 
Aqua rsh herbs ; habit various; rootstock usually creeping ; stems 
clon se “except Trigloohin), simple, or branched; leaves erect, submerged or 
floating, sheathing at the base; stipules 0, or contained in the sheath. 
Disrris. All le 
* Stigmas discoid or decurrent on the ovary. 
Perianth of sepals or scales. Flowers bisexual. 
I. Triglochin——Marsh herbs. Sepals 6, green 
II. Apono —. ee. ne 3 1-3, white or coloured. 
IIL, Potamogeton.—Aquatics. Sepals 4, herbaceous, green. 
Perianth é Flowers uni- or bi-sexual 
IV, Ruppia.—Aquatics. Stamens 2. Catsela stipitate. 
1lia.— Aquatics. Stet 1. Carpels usually sessile. 
** Stigmas subulate or ae 
Vij Zostera.— A quati Flowers sessile on a flat linear spadix. 
VII. Naia . rere Flowaes axillary. 
I. TRIGLOCHIN, Linn. 
Perianth-segments 3 or 6, herbaceous, deciduous. Stamens 6, at 
the base of the perianth-segments ; anthers didymous. Carpels els 3-6, 
1-celled, l1-ovuled, 3 often imperfect ; styles short, sometimes connate ; 
stigmas sessile or subsessile, plumose. Fruit of 3 or 6 free or connate 
achenes or follicles ; tips recurved. Seed erect; embryo straight. 
Marsh herbs with rush-like flat or terete leaves; flowers small, bisexual, spicate 
or racemose, 2-hracteate. 
regions. 
¥euit Hadar 51 eaves canaliculate es ta ae a) bulbosum. 
‘Fruit linear ; leaves afemsinge entree we he es ont iforum, 
Fruit subrotund . at era ee ae ey ae. 
