ASCLEPIADACEAE : CoNVOLVULACEAE 



751 



lanceolate to broadly so, 5-8 cm. long, l-2(-2.5) cm. wide, 

 gradually acuminate, rarely acute, sometimes obtuse at base, 

 glabrous except on midrib above, deep green and slightly 

 lustrous above, pale green beneath, the petioles 5-12 mm. long; 

 inflorescence much branched, as long as to slightly longer than 



4. HOYA R. Br. 



the leaves, the pedicels 3-5 mm. long; calyx-segments ovate, 

 slightly pilose; corolla 7-8 mm. across, purplish, the lobes 

 ovate; corona-lobes orbicular, about half as long as die gyno- 



stegium; follicles narrowly lanceolate, about 9 cm. long. 



June-July. Warmer regions; Shikoku, Kyushu. Ryukyus. 



Sakura-ran Zoku 



Scandent herbs or subshrubs, often creeping on rocks or tree-trunks; leaves opposite, fleshy, coriaceous; inflorescence in umbel- 

 late cymes, sessile or pedunculate, axillary; flowers relatively large, rarely small; calyx small, deeply 5-lobed; corolla rotate, deeply 

 5-lobed, the lobes spreading or rcflexed, valvate in bud; corona-lobes 5, fleshy, adnate to the stamen-tube, radially spreading; 

 stamens inserted at the base of the corolla, the filaments short, connate, the anthers adhering around die stigma, widi an erect 



or incurved membrane at apex, pollinia solitary in each locule, pyriform, erect; fruit a follicle. About 100 species, in the 



warmer regions of e. and s. Asia, Malaysia, and Australia. 



1. Hoya camosa (L. f.) R. Br. Asclepias carnosa L. f.; 

 H. roundijola Sieb.; H. motoskei Teijsm. & Binn.; H. carnosa 



var. japonica Sieb. ex Maxim. S.-\kura-ran. Branches 



rather thick, creeping, glabrous; leaves subcoriaceous, elliptic, 

 5-10 cm. long, 3-5 cm. wide, rounded to obtuse, mucronate, 

 obtuse at base, fleshy, lustrous, pilose beneath, peuolate; in- 

 florescence umbellate, densely flowered, the peduncles axillary. 



thick, short; flowers 12-15 mm. across, pale rose, on rather 

 slender elongate pedicels; corolla-lobes deltoid-ovate, obtuse, 

 densely short-papillose, hairy on inside; corona-lobes short, 

 narrowly deltoid, horizontally spreading, shining; follicles 

 linear, 10-14 cm. long, 6-7 mm. across; seeds oblanceolate, 4-5 



mm. long, slighdy contracted at apex, comose. June-Oct. 



Kyushu. Ryukyus, Formosa, and tropical Asia. 



5. MARSDENIA R. Br. Kijo-ran Zoku 



Shrubs or subshrubs, usually scandent, rarely suberect; leaves opposite; cymes umbellike or somewhat branched, terminal and 

 axillary, pedunculate; calyx 5-parted, the lobes obtuse; corolla campanulate or infundibuliform, rarely rotate, 5-lobed, the throat 

 constricted, sometimes hairy inside, the lobes contorted in bud, obtuse; corona-lobes 5, erect; anthers with a small membrane at 

 apex, the pollinia erect, pyriform; follicles often fleshy; seeds comose. About 70 species, tropical and subtropical. 



1. Marsdenia tomentosa Morr. & Decne. M. acuta T. 



Tanaka, excl. syn. Kijo-ran. Woody evergreen climber 



with rather thick elongate branches; leaves petiolate, orbicular, 

 7-12 cm. in diameter, abruptly acute, truncate-rounded or 

 shallowly cordate at base; inflorescence axillary, short-peduncu- 



late, shorter or as long as the petioles, 3-6 cm. long, densely 

 pilose; flowers white, about 5 mm. across; corolla campanulate, 



hairy on the throat; follicles 13-15 cm. long, rather thick. 



Aug.-Sept. Warmer regions; Honshu (Kanto Distr. and 

 westw.), Shikoku, Kyushu. Ryukyus and s. Korea. 



6. STEPHANOTIS Thouars Shitaki-s6 Zoku 



Glabrous scandent shrubs; leaves opposite, coriaceous; cymes umbellike, axillary, short-pedunculate; flowers rather large, 

 white; calyx 5-parted, the segments somewhat foliaceous, lanceolate; corolla salverform or subinfundibuliform, the tube long, the 

 lobes contorted in bud; corona-lobes 5, erect, sometimes obsolete, inserted at the back of the stamens; anthers erect, with a small 



membrane at apex, the pollinia solitary in each locule, erect on short caudicles; follicles rather thick; seeds comose. About 15 



species, in e. Asia, Malaysia, and Madagascar. 



1. Stephanotis lutchuensis Koidz. var. japonica (Ma- 

 kino) Hatus. S. japonica Makino Shitaki-s6. Much- 

 elongate woody climber with yellowish pubescent young 

 branches; leaves thick-membranous, oblong to broadly ovate, 

 6-12 cm. long, 3-6 cm. wide, acute to abruptly acuminate, 

 rounded to shallowly cordate at base, with sparse persistent 

 crispate hairs on nerves on both surfaces, the petioles 1.5-2.5 

 (-3) cm. long; peduncles axillary, shorter than to as long as 

 the petioles, 2- or 3-flowered at the top, the pedicels longer 

 than the peduncle, shorter than the flowers; flowers white, fra- 

 grant; calyx-segments 1/2-3/4 as long as the corolla-tube, 

 rounded to subacute; corolla-tube 12-14 mm. long, hairy inside. 



the lobes lanceolate, obliquely spreading, subobtuse, about 20 

 mm. long. June. Honshu (Awa Prov. and westw.), Shi- 

 koku, Kyushu. 



Var. lutchuensis. S. lutc/iuensis Koidz. Okinawa-shi- 

 TAKi-zuRU. Resembles the preceding but smaller; leaves ob- 

 long or ovate, 6-10 cm. long, 3-6 cm. wide, usually rounded at 

 base, the petioles 1.5-2 cm. long; peduncles axillary, shorter 

 than the petioles, die pedicels 2-5, about 1.5 cm. long, nearly as 

 long as the flowers; flowers white, fragrant; corolla-tube 7-8 

 mm. long, hairy inside, to rwice as long as the calyx, the lobes 

 broadly lanceolate, slightly reflexed, subobtuse, about 10 mm. 

 long. June-July. Kyushu (s. distr.). Ryukyus. 



Fam. 171. CONVOLVULACEAE Hirugao Ka Morning-glory Family 



Herbs or often scandent woody plants, often with milky juice; leaves simple, alternate, exstipulate; flowers bisexual, actino- 

 morphic, the bracts often involucrelike; calyx-segments usually free, imbricate in bud, persistent; corolla usually infundibuliform, 

 the lobes contorted in bud; stamens inserted on the lower part of the corolla and alternate with the lobes, the andiers 2-locular, 

 longitudinally dehiscent; ovary often surrounded by a disc at base, 1- to 4-locular; ovules 1 or 2 in each locule, erect; style erect, 

 terminal; fruit dehiscent and capsular or indehiscent and fleshy; seeds often hairy, with scanty endosperm; cotyledons infolded 

 or wrinkled. About 50 genera, with more than 1,200 species, chiefly tropical and subtropical, abundant in Asia and America. 



