RUBIACEÆ. CCXX. Opercuraria. 
Partial involucra 4-5 in the same head, each containing 2-4 
flowers. Corollas 4-5-cleft, monandrous or diandrous, white. 
Leaves like those of the species of Lindria. 
Sessile-flowered Opercularia. Fl. June, July. 
Pl, diffuse. 
3 0. APICIFLORA (Labill. nov. holl. 1. p- 35. t. 48.) glabrous ; 
stems diffuse, very slender, furrowed; leaves oblong-linear, 
short ; stipulas joined in one on both sides; heads of flowers 
terminal, small, hemispherical, involucrated by about 4 verticil- 
late leaves. h. G. Native of New Holland, in Van Lewin’s 
Land. Juss. mem. mus. 4. p. 427. Partial involucra 1-3 in 
each head, each containing 3-4 flowers. Corollas 4-5-cleft ; 
monandrous or diandrous, white. (Fig. 112.). 
Top-flowered Opercularia. Shrub 1 foot. 
4 O. spermacdcea (Labill. nov. holl. 1. p. 35. t. 47.) gla- 
brous; stem shrubby, erect; leaves linear, almost triquetrous ; 
stipulas combined in one on both sides, bidentate at the apex ; 
heads spherical, pedunculate, terminal. h. G. Native of New 
Holland, in Lewin’s Land. Juss. ann. mus. 4. p. 427. Leaves 
falsely verticillate. Partial involucra 4-5 in the same head, each 
bearing 4 flowers. Habit of Spermacàce verticillata. 
Spermacoce-like Opercularia. Shrub 1 foot. 
5 O. vacina‘ra (Labill. nov. holl. 1. p- 34. t. 46.) glabrous ; 
stem erect, woody at the base, rather angular; leaves linear; 
stipulas combined into a long sheath, which is bidentate at top 
on both sides ; heads globose, naked, terminal, h.G. Native 
of New Holland, in Van Lewin’s Land. Juss. ann. mus. 4. p. 
428. Partial involucra 5-9 in a head, each containing 3-5 
flowers. Corolla 4-cleft. Stamens 4, ex Labill. 
Sheathed-stipuled Opercularia. Shrub 1 foot. 
6 O. nirte’txa (D. C. prod. 4. p. 616.) stem rather angular, 
and rather pilose at the apex ; branches elongated ; leaves linear, 
stipulas lanceolate-subulate ; heads of flowers pedunculate, 
drooping, hairy, rising from the forks of the branches. Y. G. 
ative of New Holland. Branches, leaves, and stipulas beset 
with longish hairs. 
Hairy Opercularia. Pl. 1 foot.? 
7 O. HYSSOPIFÒLIA (Juss. mem. mus. 4. p. 428. t. 71. f. 1.) 
stem erect, rather angular, clothed with short down; leaves 
narrow-lanceolate, with somewhat ciliated margins; stipulas 
combined entire, acute; heads of flowers rising from the forks 
of the branches, on short peduncles, drooping a little, globose. 
; Native of New Holland. Partial involucra about 5 
m every head, each containing 2-4 flowers. 
Hyssop-leaved Opercularia. Shrub 1 foot, 
+ LIGUSTRIFÒLIA (Juss. mem. mus, 4. p. 428. t. 71. f. 2.) 
stem erectish, tetragonal, hairy from short down, but glabrous 
etween the nodi ; stipulas combined at the base on both sides, 
acutely 2-lobed ; heads of flowers rising from the forks of the 
aches, on short peduncles, drooping. h.G. Native of New 
olland, about Port Jackson. ‘The rest as in the preceding 
Species, 
Privet-leaved Opercularia. Shrub 1 foot. 
Yee PALEA`TA (Young, in Lin. trans. 3. p. 30. t. 5.) gla- 
A S stems herbaceous, tetragonal, erect; leaves ovate-lan- 
lob. ate, acute; stipulas combined on both sides, acutely 2- 
Obed; heads of flowers pedicellate, drooping when in flower, 
rising from the forks of the branches, globose, involucrated. 2. 
Native of New Holland. Juss. ann. mus. 4. p. 428. 
ryptospérmum Youngii, Pers. ench. 1. p. 122. Partial invo- 
ucra almost 20 in every head, each containing 5-6 flowers. Co- 
ae 4-cleft, pale green. Stamens 4. Universal involucrum 
i Parted, composed of 2 leaves and 4 stipulas. Peduncles some- 
mes the length of the heads, and sometimes 3 times that length. 
Anthers whitish. 
Chaffy Opercularia. Fl. July, Aug. Clt.1793. Shrub 4 feet. 
Cit. 1824. 
CCXXI. Lirosroma. 663 
10 O. ocymiréxt1a (Juss. ann. muss. 4. p. 428. t. 71. f. 3.) 
glabrous ; stems diffuse, tetragonal, furrowed ; leaves ovate-ob- 
long, petiolate; stipulas combined in one on both sides ; heads 
of flowers rising from the forks of the branches, on short pedun- 
cles, drooping, globose, naked. %. G. Native of New Hol- 
land. Heads larger than peas, with 7-9 partial involucra in 
every head, each containing 4-6 flowers. Corolla 3-4-cleft. 
Stamens 2-3, ex Juss. 
Basil-leaved Opercularia. 
1 foot. 
11 O. rusroipes (Juss. ann. mus. 4. p. 428.) stems tetragonal, 
ascending, glabrous; leaves lanceolate, with revolute margins ; 
margins and middle nerve scabrous beneath; stipulas combined 
on both sides, entire or bidentate; heads on short peduncles, 
rising from the forks of the branches, drooping, globose, naked. 
. G. Native of New Holland, on the Eastern Coast. 
Heads of flowers larger than peas. Partial involucra 5-7 in 
every head, each containing 5-6 flowers. Corolla 3-4-cleft. 
Stamens 3-4. 
Madder-like Opercularia. Pl. 14 foot. 
+ Doubtful species. 
12 O. a’spera (Geertn. fruct. 1. p. 112. t. 24.) leaves oblong, 
scabrous, veiny; heads of flowers pedunculate, axillary.— Native 
of New Zealand, ex Solander. O. aspera, Spreng. syst. 1. p. 
385. Probably the same as O. hispida. 
Rough Opercularia. Pl. 1 foot. 
13 Ò. DIPHY'LLA (Gertn. l. c. pe 113.) stem and leaves un- 
known; heads of flowers rising from the forks of the branches ; 
partial involucra hispid, many in every head, each containing 3-4 
flowers; flowers tetrandrous.—Native of New Zealand. Juss. 
ann. mus. 4. p. 428. Rubioides diphylla, Soland. mss. The 
rest unknown. 
Two-leaved Opercularia. Pl. 1 foot? 
Cult. For culture and propagation see Poma., p. 662. 
Fl. June, July. Clt. 1824. Pl. 
CCXXI. LIPO/STOMA (from derrw, leipo, to fall from, and 
cropa, stoma, a mouth; lid from capsule). D. Don, in edinb. 
new phil. journ. Jan. 1830. Sweet, fl. gard. n. s. with a figure. 
Lin. syst. Tetrándria, Monogynia. Limb of calyx 4-parted. 
Corolla tubular at the base, and ventricose at the throat, and 
bearded inside, with a 4-lobed limb; lobes ovate, spreading, 
valvate in zstivation. Stamens 4, inserted in the throat, ex- 
serted; filaments compressed; anthers linear, versatile. Style 
capillary; stigmas 2, subulate, hispid. Capsule globose, 2- 
celled, opercular, many seeded, but often l-celled from the 
middle dissepiment having vanished. Placentas 2, spherical, 
stipitate, inserted beneath the middle of the dissepiment. Seed 
small, angular, scabrous. Embryo slender, with oblong plano- 
convex cotyledons, and a cylindrical obtuse radicle, which is a 
little longer than the cotyledons.—Diffuse trailing pilose herbs, 
natives of Brazil. Leaves opposite, petiolate. Stipulas subu- 
late, interpetiolar. Flowers sessile, capitate, intermixed with 
bracteas. Heads of flowers pedunculate, solitary, axillary. 
Corollas blue. 
1 L. carıra`ra (D. Don, l. c.) plant hairy ; leaves roundish, 
undulated, green, spreading. Y%.S. Native of Brazil. Ægi- 
nétia capitàta, Graham, in edinb. new phil. journ. April, 1828. 
p- 389. Hedyòtis campanuliflora, Hook. bot. mag. t. 2840. 
Corollas rather large, fine blue, with a yellow throat, pilose 
outside. 
Capitate-flowered Lipostoma. Pl. trailing. 
2 L. serrceum (D. Don, 1. c.) plant hairy; hairs adpressed ; 
leaves ovate, acute, when young silky. 4. S. Native of Bra- 
zil, in pastures. The whole plant is clothed with silky adpressed 
hairs. Heads of flowers smaller than the preceding. Coro!la 
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