AN ENCYCLOPADIA OF HORTICULTURE. 
353 
MENTZELIA (named after Christian Mentzel, 1622- 
1701, a German botanist). Including Eucnide and Micro- 
sperma. ORD. Loaseew. A genus of hardy, annual, 
biennial, or perennial, herbaceous plants, found chiefly 
in Mexico, California, and the Southern United States. 
Flowers orange or white, solitary, racemose or cymose, 
opening only during sunshine. Leaves alternate or 
nearly opposite, coarsely toothed. For culture, &., see 
Bartonia (which genus is now generally included under 
the present one). 
Fic. 549. PORTION OF PLANT OF MENTZELIA BARTONIOIDES. 
M. bartonioides (Bartonia-like).* solitary, terminal; petals 
sulphur-yellow, paler, c white 3 ovate or rather ob- 
ovate serrated, on dicels. Summer. /. ovate, acute, 
lobed 3 8 lit. m , flexuose, succulent, 
sub-translucent. Western United ted Bint, © . Annual. See Fig. 
Eucnide bartonioides and Microsperma bartonivides 
M. hispida (hairy). ellow ; petals obovate, mucronately acu- 
minate, longer than ie ole June and J 
J. near nearly sessile. h. 1sft. Mesio, 1820. Perennial. (B. M. 
Vol. II. 
Mentzelia continued. 
M. levicaulis ee A. bright yellow, from 2gin, to 
Sin. across, expanding only in the 1 and closing after 
noon, Summer. h. 2ft. California. Biennial. 
M. oligosperma 8 bool gy ented petals acuminate ; 
uncles axillary, solitary. June. jr. 8 Stem 
ranched, R. 2f pons Ags 1812. Perennial. (B. M. 1760.) 
Fic, 550. UPPER PORTION or PLANT OF 
MENTZELIA ORNATA. 
“age ai jl. white, 201 2 odori- 
r sunset, and remaining 
closed up the whole of the ie day. July ya 
naked. 
tember. P teag l. iniae: “ha 
hispid, glan h. 2ft. i a a 
ey See Fig. 50 (B. M. 1487, under 
name of Bartonia eae 
MENYANTHES (ancient name, from 
men, a month, and anthos, a flower; in 
allusion to the duration of the flower). 
Buckbean. ORD. Gentianee. A genus 
(two species) of very ornamental 
perennial aquatics, natives of Arctic 
Europe, North Asia, North-west India, 
and North America. Flowers white or 
bluish, oe of the scapes, or in 
long, terminal, leafless, shortly racemose 
peduncles; corolla 5 ee e 
Leaves alternate at base of stem, either 
trifoliolate or reniform, on long petioles, 
with scarious £ bases. Rootstocks 
ferous, N — 
i ans a shade 
Mor Torkeð cme 5 jga weeping but with a 
SYN. Villarsia Crista- 
a 3 (Sy. En. B. 920.) 
MENZIESIA (named after Archibald Menzies, 1754- 
1842, and naturalist to the expedition under 
Vancouver). ORD. Ericacee. A genus comprising seven 
species of hardy, Heath-like shrubs, natives of North 
America and Japan. Flowers white, greenish, or purple, 
in terminal corymbose fascicles, nodding or drooping; 
corolla cylindric-globose, urceolate or campanulate, ob- 
tusely four oF fiye-lobed. Leaves alternate, petiolate, 
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