224 
PLANTS INDIGENOUS TO 
I. monopetalum, it was found requisite to distinguish our plant under a new appellation. In choosing that 
here adopted the author wishes to express a mark of acknowledgment for much aid, which in formino- 
collections of plants in the classical fields around Port Jackson, he experienced from Mr. "W. Vernon of 
Sydney. 
I. monopetalum may readily be recognized by the notes early offered by Roemer and Schultes (Syst. y. 
400), but which have not been sufficiently recorded by Gingins (in Cand. Prodr. i. 307). These notes consist 
in terete stems, (partially) opposite leaves and two-flowered long peduncles, and these point solely to the 
plant, which at page 66 of this volume has been referred to I. filiforme, in accordance with the views of D. 
Dietrich (Synops. Plant, i. 838), of Steudel (Nomenclator Botanic, i. 814) and of Asa Gray r (Botany of Unit. 
Stat. Explor. Exped. i. 87), although it must be admitted, that only by comparison of authentic specimens it 
can be ascertained, wdiether I. filiforme is not rather to he sought in the here described new species. If 
I. filiforme should prove identical with I. monopetalum, the former name would remain preferable, since 
Schultes’ designation conveys an erroneous idea of the structure of the flower. As pointed out at page 68 of 
this work, our new Ionidium has many notes in common with I. enneaspermum (Vent. Malm. p. 27), of 
which I. sufiruticosum (Roth, in Roem. & Schult. Syst. Veg. v. 394) forms a variety, as pointed out by 
Sprengel (Syst. Veg. i. 804). An excellent description of I. sufiruticosum is furnished by Roxburgh (Flora 
Indica, ii. 447), in w'hich particularly is alluded to the rosy petals and the hornlets of the lower filaments. 
To these marks may be added, that I. enneaspermum is often downy, that the stipules are more conspicuous, 
that the peduncles excel the pedicel in length, that the labellum is never blue although not rarely brick- 
colored, that the lower pair of petals is more inequilateral and long-acuminate, that the upper petals are 
oblong, three-nerved and abrubtly short-acuminate, and that the filaments are longer. A comparison of the 
fruits will hereafter probably render these distinctions still ampler. Referring to our description of the 
assumed I. filiforme it will be seen, that it is easily recognized by almost terete branches, larger stipules, of 
which the upper ones are membranous, by partially opposite leaves, by long peduncles, by leafless racemes, by 
acuminate lateral petals and more distinctly bidentate anthers. 
— I. calycinum (Steudel, Nomencl. Bot. i. 813; Pigea calycina, Cand. Prodr. i. 307; P. glauca, Endl. 
in Hueg. Enum. p. 5), a strictly "Western Australian plant, is still less likely than I. monopetalum to be con¬ 
fused with our plant. 
Ionidium filiforme— p . 66. 
Ripe seeds brown-black. 
Hymenantiiera Banksii— p . 69. 
Observed in the valleys of the remotest eastern tracts of the colony to attain the height of fully 20 feet. 
Flowers very fragrant. 
PlTTOSPORUM UNDULATUM — p. 71. 
At Corner Inlet, -where, according to Mr. Wilhelmi’s-remarks, it attains a height of 60 feet; on Phillip 
Island; in the fern-tree gullies near the Taiwan; on the lower Genoa River. 
PlTTOSPORUM BICOLOR — p. 72. 
To this species is in all probability to be reduced P. discolor (Regel, Gartenflora, i. 133,1.15), according 
to the diagnosis republished by Dr. C. Mueller (in Walp. Annal. Bot. Syst. iv. 242). 
Pittosporum revolutum, Dryander, in Ait . Hort. Kew. edit . 2, vol ii. 27; Loddig. Bot. Cabinet , 
506; Bot. Reg. iii. 186; P. tomentosum, Bonpl, Malmais. i. 57, t. 21; Diet. Sdenc. Nat. 1. 129; Lodi Cab. 
1441; Street, Flor. Austral, 33; P. fulvum, Budge , in Transact . Linn. Soc. x. 298, t, 20; Street, Flor. Austral 
25; P. rubiginosum, B. Gunn, in Annal. of Nat. Hist. iv. 108. 
