14 DENDROBIUM. 



is to say, the house should be only moderately filled with smoke in the 

 evening, and again on the following morning, or the operation may be 

 repeated on consecutive evenings till the thrip has disappeared ; too much 

 smoke at one time is injurious to the foliage, and causes the loss of 

 many leaves, and consequently a check to the growth of the plants. 



Synopsis of Species and Varieties. 



Dendrobium aduncum. 



Stachyobium — Speclosce. Stems slender, pendulous, 18 — 24 inches long. 



Leaves elliptic-lanceolate, acute, 2| — 3 inches long. Mowers about an 



inch in diameter, either solitary or in short racemes, pale rose suffused 



with white ; sepals and petals nearly similar, the former ovate, acute, 



the latter oblong ; lip clawed with an ovate, concave blade, terminating 



in a hooked tip. Column bearded ; anther deep purple. 



Dendrobium aduncum, Wallich, MS. fide Lindl. Bot. Reg. 1842, misc. 62. Id. 

 1846, t. 15. Bot. Mag. t. 6784. 



First sent by Dr. Wallich to Messrs. Loddiges' Nursery at 

 Hackney, in 1842 ; a few years later it was received at the Exeter 

 Nursery from Thomas Lobb, and subsequently (in 1868) it was 

 sent to the late Mr. John Day, from Assam, by his nephew, 

 Captain W. J. Williamson. Quite recently (1883) it was dis- 

 covered by Mr. Charles Ford, Superintendent of the Botanic 

 Garden at Hong Kong, during an excursion which he made to the 

 Lo-fau-shan Mountains in China, near the coast opposite the island, 

 and where he collected plants which he transmitted to the Royal 

 Gardens at Kew. The specific name aduncum, " hooked," probably 

 refers to the hook-like apiculns of the lip. 



D. senmlum. 



Stachyobium — Speciosce. Stems terete, 2 — 4 or more inches long, 

 " sometimes tapering into a long thin base with a small pseudo-bulb," 

 and bearing at their summit 2 — 3 very coriaceous ovate-oblong or elliptic- 

 oblong leaves. Racemes terminal, both from leafless and leafing stems, 

 lax, 5 — 7 flowered. Flowers 1£ inches across, fragrant, white, the apical 

 half of the segments sometimes stained with pale yellow, the side 

 lobes of the lip spotted with rose-pink ; sepals narrowly lanceolate ; petals 

 linear ; lip very short, three-lobed, with three greenish raised plates 

 between the side lobes, merging into a single broad one on the middle 

 lobe ; side lobes acute, middle lobe reflexed. 



Dendrobium semulum, R. Br. Prod. Fl. Nov. Holl. p. 333 (1810). Bot. Mag. 

 t. 2906 (1829). Benth. Fl. Austr. VI. p. 282. Fitzgerald's Austr. Orch. I. 

 Part 2, t. 5. 



