RUBIACE^E. CCXX. OPERCULARIA. CCXXI. LIPOSTOMA. 



663 



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 Linaria. 



Sessile-flowered Opercularia. Fl. June, July. Clt. 1824. 

 PI. diffuse. 



3 O. 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. I? . 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. SPERMACOCEA (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, fy . 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 Spermacdce verticillata. 



Spermacoce-Mke Opercularia. Shrub 1 foot. 



5 O. VAGINA'TA (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. Tj . 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-st'npu\ed Opercularia. Shrub 1 foot. 



6 O. HIRTE LLA (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. I/ . G. 

 Native of New Holland. Branches, leaves, and stipulas beset 

 with longish hairs. 



Hairy Opercularia. PI. 1 foot. ? 



7 O. HYSSOPIFOLIA (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. 



\l . G. Native of New Holland. Partial involucra about 5 

 in every head, each containing 2-4 flowers. 

 Hyssop-leaved Opercularia. Shrub 1 foot. 



8 O. LIGUSTRIFOLIA (Juss. mem. mus. 4. p. 428. t. 71. f. 2.) 

 stem erectish, tetragonal, hairy from short down, but glabrous 

 between the nodi ; stipulas combined at the base on both sides, 

 acutely 2-lobed ; heads of flowers rising from the forks of the 

 brandies, on short peduncles, drooping. Tj . G. Native of New 

 Holland, about Port Jackson. The rest as in the preceding 

 species. 



Privet-leaved Opercularia. Shrub 1 foot. 



9 O. PALEA'TA (Young, in Lin. trans. 3. p. 30. t. 5.) gla- 

 brous ; stems herbaceous, tetragonal, erect ; leaves ovate-lan- 

 ceolate, acute ; stipulas combined on both sides, acutely 2- 

 lobed ; heads of flowers pedicellate, drooping when in flower, 

 rising from the forks of the branches, globose, involucrated. ^ . 

 G. Native of New Holland. Juss. ann. mus. 4. p. 428. 

 Cryptospermum Youngii, Pers. ench. 1. p. 122. Partial invo- 

 lucra almost 20 in every head, each containing 5-6 flowers. Co- 

 rolla 4-cleft, pale green. Stamens 4. Universal involucrum 

 6-parted, composed of 2 leaves and 4 stipulas. Peduncles some- 

 times the length of the heads, and sometimes 3 times that length. 

 Anthers whitish. 



Chaffy Opercularia. Fl. July, Aug. Clt. 1 793. Shrub 4 feet. 



10 O. OCYMIFOLIA (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. 7JL. 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. Fl. June, July. Clt. 1824. PI. 

 1 foot. 



1 1 O. RUBIOIDES (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. 



fj . 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. PI. 1 ^ foot. 



f- Doubtful species. 



12 O. A'SPERA (Gaertn. 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 0. hispida. 



Rough Opercularia. PI. 1 foot. 



13 O. DIPHY'LLA (Gaertn. 1. c. p. 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. PI. 1 foot ? 



Cult. For culture and propagation see Pomax, p. 662. 



CCXXI. LIPO'STOMA (from Xeiirw, leipo, to fall from, and 

 arofia, sloma, a mouth ; lid from capsule). D. Don, in edinb. 

 new phil. journ. Jan. 1830. Sweet, fl. gard. n. s. with a figure. 



LIN. SYST. Tetr&ndria, 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 aestivation. 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 1 -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. CAPITA'TA (D. Don, 1. c.) plant hairy ; leaves roundish, 

 undulated, green, spreading. I/ . S. Native of Brazil. ^Egi- 

 netia capitata, Graham, in edinb. new phil. journ. April, 1828. 

 p. 389. Hedyotis campanuliflora, Hook. bot. mag. t. 2840. 

 Corollas rather large, fine blue, with a yellow throat, pilose 

 outside. 



Capitate-flowered Lipostoma. PI. trailing. 



2 L. SERI'CEUM (D. Don, 1. c.) plant hairy ; hairs adpressed ; 

 leaves ovate, acute, when young silky. I/ . S. Native of Bra- 

 zil, in pastures. The whole plant is clothed with silky adpressed 

 hairs. Heads of flowers smaller than the preceding. Corolla 



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