XXXV. HALORKHAGIDACEAS 
189 
Glabrous herbs, growing in water or on mud ; stems slender, 
brittle, intricately branched, rooting at the joints. Leaves undi- 
vided, entire, lower opposite, uppermost crowded in little, flat 
rosettes. Flowers axillary, usually solitary, each between two 
minute bracts (sometimes 'wanting). Calyx and corolla none. 
Male flowers : a solitary stamen, filament long. Female flowers : 
a 4-lobed ovary ; styles 2, long, thread-like. Fruit orbicular, 
flattened, sessile or nearly sessile. 
Margins of fruit winged, acute 1. C. stagnalis. 
Margins of fruit not winged, blunt . . . . . 2. C. verna. 
1. Callitriche stagnalis, Scop. ; FI. Br. Ind. ii. 434. Leaves 
ovate or spathulate, sometimes very narrow, about \ in. long. 
Margins of fruit winged, acute. 
Sipi, below Mushobra ; August, September. — Mountainous regions through- 
out India, 5000-10,000 ft.— Cosmopolitan (Britain). 
*2. Callitriche verna, Linn . ; FI. Br. Bid. ii. 434. Leaves oblong 
or spathulate, in. Margins of fruit not winged, blunt. 
W. Himalaya, 5000-8000 ft. — Nearly all temperate and cold climates, inclu- 
ding Britain. 
XXXVI. MYRTACE^E 
A very large Order inhabiting nearly all tropical and most sub- 
tropical regions. Abundant throughout India, but only a single 
species extends into the outer valleys of the N.W. Himalaya. — 
Myrtus is the classical name of the common Myrtle. 
The Australian Gum trees, Eucalyptus , belong to this Order ; E. Globulus 
and E. obliqua have been planted at Simla several times, but they usually 
succumbed to the winter frosts. 
EUGENIA. In honour of Prince Eugene of Savoy of the 
seventeenth century, a patron of botany. — Most tropical regions. 
Eugenia Jambolana, Lam. ; FI. Br. Ind. ii. 499. A glabrous 
tree. Leaves firm, shining, covered with minute, transparent dots, 
opposite, stalked, ovate or ovate-lanceolate, 3-6 in., entire, usually 
long-pointed ; lateral veins numerous, parallel, uniting to form a 
single vein running just within the margin ; stipules none. Flowers 
2-sexual, regular, pale green, J-J in. long to the tips of the stamens, 
nearly sessile, crowded in small, rounded clusters terminal on the 
branches of lateral panicles 2-4 in. long. Calyx-tube adnate to 
the ovary, funnel-shaped ; limb shortly 4-lobed. Petals 4, rounded, 
