Art. XXIII—New Species of Plants.
[Read before the Auckland Institute, 22nd November, 1910.]
1. Lepidium tenuicaule T. Kirk var. minor Cheesem. n. var.
Planta pumila, depressa; caulibus brevissimis, 1–2 ½ cm. longis; folis numerosibus, omnibus radicalibus.
Hab.—North Island: Titahi Bay, near Wellington; B. C. Aston!
A curious little plant, differing from all the specimens of L. tenuicaule that I have seen in the much-reduced size, the stems never exceeding an inch in length. The whole plant is also much more thick and fleshy than is usual in the typical state. I have not seen ripe fruit, but the flowers appear to match those of the ordinary form. Mr. Aston is the first to discover the species in the North Island.
2. Chordospartium Cheesem. gen.ov.
Arbor vel frutex parva, aphylla; ramis junceis pendulis, squamulis ad nodos minimis. Flores purpurei, in racemos multifloros dispositi. Bracteae et bracteolae parvae. Calycis dentes breves, subaequales vel superiores minores. Vexillum orbiculatum, reflexum, in unguem brevem contractum; alae dolabriforme-falcatae, liberae, vexillo breviores; carina incurva, obtusa, vexillum subaequans. Stamen vexillare liberum, caetera in vaginam connata; antherae uniformes. Ovarium sessile, sericeum, 3–5 ovulatum; stylus incurvus, apice inflexus, intus longitudinaliter barbatus; stigmate minuto terminali. Legumen brevem, turgidum, rhombeo-ovoideum, in curvum, indehiscens. Semen solitarium, estrophiolatum; radicula elongata, biplicata.
Chordospartium Stevensoni Cheesem. species unica.
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A leafless shrub or small tree, sometimes attaining a height of 20 ft. or more, with a trunk 6–8 in. in diameter. Branches long, slender, pendulous, terete or subcompressed, grooved; branchlets 1/15 in. diameter, glabrous, marked with distant nodes, each node with a minute scale. Leaves not seen. Racemes springing from the nodes of the branchlets, single or in fasciles of 2–5, ¾-1½ in. long, very many-flowered; rhachis densely woolly; pedicels very short; bracts and bracteoles minute. Flowers ⅓ in. long, purple, with darker lines on the standard. Calyx densely woolly, cup-shaped, minutely 5-toothed. Standard orbicular, reflexed, narrowed into a very short claw at the base. Wings dolabriform, falcate, obtuse, shorter than the keel. Keel incurved, obtuse, equalling the standard. Upper stamen free; the others connate into a sheath. Ovary sessile, densely silky, linear-oblong, gradually narrowed into the style; ovules 3–5; style long, slender, incurved, longitudinally bearded on the inner side above; stigma minute, terminal. Pod about ⅕ in. long, more or less silky, short, turgid, ovoid or orbicular-rhomboid, straight in front, rounded at the back. Seed solitary, transversely oblong; radicle long, with a double flexure.
Hab.—South Island: Foothills of the Seaward Kaikoura Mountains, near the mouth of the Clarence River; altitude, 1,500-2,500 ft.; Mr. George Stevenson!
A very remarkable plant, in some respects connecting the genera Corallospartium, Carmichaelia, and Notospartium. It agrees with the first in the short turgid subrhomboid 1-seeded pod, and in the groved branchlets, but differs altogether in habit, in the slender branchlets, and in the markedly different inflorescence. From the section Huttonella of Carmichaelia it is separated by the same characters. It entirely corresponds with Notospartium in habit and inflorescence, and has probably been mistaken for that genus in the absence of fruit, which at once distinguishes the two genera.
Although I consider that the characters of Chordospartium fully justify its erection into a separate genus, it must be confessed that the differences between it and Corallospartium are not of a very pronounced type. If, however, differences of habit, inflorescence, &c., are not considered sufficient to separate Corallospartium and Chordospartium, then, by parity of reasoning, similar characters of no greater importance cannot be used to distinguish both these groups from the section Huttonella of Carmichaelia, and the three genera must merge into one. Some botanists may prefer this course, for it is very much a matter of taste and personal idiosyncrasy whichever view is adopted.
I have to express my obligations to Mr. Stevenson for his kindness in forwarding and ample supply of both flowering and fruiting specimens. Most of these were obtained from a tree growing near his house, which he describes as a beautiful specimen, with a stem bare of branches for about 8 ft., above which “it is a perfect weeping model all round for quite 15 ft.” Its girth at about 2 ft. from the ground was 20 in. The flowering season stretches from the middle of November to the end of December, and the fruit is ripe at the beginning of April. I have also to thank Mr. T. Keir, of Rangiora, for placing me in communication with Mr. Stevenson, and for much valuable assistance in obtaining specimens and information. A drawing of the plant, with full analyses, will appear in the forthcoming “Illustrations of the New Zealand Flora.”
3. Senecio Turneri Cheesem. sp. nov.
Affinis S. latifolio Banks et Soland., sed foliis magnis ovato-cordatis distinctissima.
Caulis robustus, 0·6-1·8 m. altus, inferne lignosus, prostratus vel decumbens, nudus; superne erectus, foliatus; versus apicem ramosus. Folia alterna, magna; petioli 15–30 cm. longa, basi longe vaginantes; lamina 10–18 cm. longa, 7–15 cm. diam., cordata vel rotundata-cordata, acuta, membranacea; venis reticulatis; marginibus sinuatis et spinuloso-serratis. Folia caulina minora, petiolis brevioribus, auriculis magnis. Bracteae numerosae, lanceolatae. Corymbi laxo, ramosi; ramis gracilibus. capitula numerosa, 2–3 cm. diam.; involucri squamae 1-seriales, linerares vel lanceolatae, glabrae vel parce pubescentes. Achenia matura non visa. Pappus mollis, copiosus, albus.
Hab.—North Island: On the faces of wet cliffs by the Upper Wanganui River, both above and below the junction of the Mangaio Stream; jE. Phillps Turnre!
A stout glabrous herb 2–6 ft. high. Stem as thick as the finger, woody, prostrate or decumbent and usually naked at the base, leafy above, sparingly branched at the top only. Leaves alternate, large, spreading, bright green, petiole 6–12 in. long, winged at the base and broadly amplexicaul, smooth
and terete above; blade 4–7 in. ling by 3–6 in. across, cordate to orbicular-cordate, deeply lobed at the base, acute at the tip, thin and membranous, veins reticulate, margins sinuate and finely spinuloso-serrate. Caluline leaves smaller, on shorter petioles, with large leafy auricles and smaller narrower blades, gradually passing into lanceolate or linear entire bracts. Corymbs large and broad, much branched;; branches slender. Heads very numerous, ¾-1 ¼ in. diameter, bright yellow; involucral bracts in a single series, linear of obling-linear, acute, glabrous or finely pubescent. Ray-florets 10–15; ligule narrow, spreading; spreading; disc-florets 25–35. Rpe achenes not seen. Pappus soft, copious, white.
One of the most distinct species added to the New Zealand flora of late years. Although allied to S. latifolius, it differs widely in habit, in the large cordate leaves, which are never lobulate or pinnatifid, but have their margins finely spinulose-serrate, in the long terete petioles, and in the larger flower-heads. I have much pleasure in dedicating it to its zealous discoverer, who has done excellent botanical work in the interior of the North Island of late years.
Mr. Turner remarks, “As far as at present noticed, the plant is restricted to the mouth of the Mangaio Gorge and the steep papa clifis of the Wanganui River above and near the junction, but I have found only one place at which it can be conveniently reached. It is associated with Ourisia macrophylla, Senecio latifolius, Elatostemma rugosum, and Lomaria capensis, and grows only were the cliffs are wet and shaded. From a little distance the large bright-green leaves give the plant somewhat the appearance of the arum lily.”
4. Thelymitra Matthewsii Cheesem. sp. nov.
T,. vaiiegata Lindl. affinis, sed caule multo breviore, floribus singularibgus, gynostemio non cristato.
Caulis gracilis, flexuosus, 9–14 cm. longus. Folium solitarium, 3–6 cm. longum, spiraliter contortum, lineare, basi ampliato. Bracteae 2. Flos solitarius, ratione plantae magnus, 1–2 cm. diametro. Perianthium subregulare, patens. Sepala et petala simila, lanceolata vel ovatp-lanceolata, acuta vel acuminata. Gynostemium breve, bialatum, aliis magnis, crassis, clavatis aut lobatis.
Hab.—North Island: Mangonui County, low hills between Lake Tongonge and the coast; R. H. Matthews!
Stem slender, wiry, flexuose, 4–6 in. high. Leaf solitary, sheathing the stem at eh base, the sheath finely and closely puberulous; lanina 1 ½-2 ½ in. long, much expanded at the base, and then suddenly narrowed into a linear blade, which is usually spirally twisted so as to coil round the stem; margins involute. Bracts 2, the lower one below the middle of the stem, the upper almost close to the flower, both broad and sheathing Flower solitary, large for the size of the plant, ½-¾ in. diameter. Perianth-segments alike, lanceolate or oblong-lanceolate, acute or shortly acuminate. dark purplish-blue with darker longitudinal veins. Column much shorter than the perianth-segments, ot produced at the back behind the anther, and which are oblong or oblong-falcate, obtuse, somewhat flattened but thick and fleshy, not lobed nor furnished with cilia. Occasionally there Anther very large, oblong, obtuse. Base of the column purplish; lateral jobes and anther bright yellow.
A charming little plant, worthily dedicated to its discoverer, who has added more to our knowledge of the New zealand orchids than any other observer of late years. It is closely allied to the Western Australian T. variegata Lindl., principally differing in the much smaller size, in the solitary flowers, and in the column-wing scarcely on the back behind the anther. Mr. Matthews informs me that the remarkabel spiral twist or coil in the leaves in sonstant in all the specimens he has seen. This peculiarity is also more or less observable in T. variegata.