Homalium sect. Nisa (Noronha ex Thouars) Baill. ex Warb.

Wassel, Anna C. & Applequist, Wendy L., 2020, A revision of Homalium sect. Nisa (Salicaceae) endemic to Madagascar, Candollea 75 (1), pp. 1-23 : 3-4

publication ID

https://doi.org/ 10.15553/c2020v751a1

DOI

https://doi.org/10.5281/zenodo.6339046

persistent identifier

https://treatment.plazi.org/id/B14E878C-FFC7-2C20-FCDA-033125B5EC79

treatment provided by

Carolina

scientific name

Homalium sect. Nisa (Noronha ex Thouars) Baill. ex Warb.
status

 

Homalium sect. Nisa (Noronha ex Thouars) Baill. ex Warb.

in Engl. & Prantl, Nat. Pflanzenfam. 98–99: 36. 1893.

Nisa Noronha ex Thouars , Gen. Nov. Madagasc.: 24. 1806. ≡ Homalium View in CoL [unranked as §] Nisa (Noronha ex Thouars) Baill. in Bull. Mens. Soc. Linn. Paris 1: 575. 1886.

Typus (designated by SLEUMER, 1973: 295): Homalium nudiflorum (DC.) Baill. View in CoL (≡ Nisa nudiflora DC. View in CoL ).

Stipules opposite the petiole base and fused (in H. intercedens Sleumer axillary, free), usually caducous. Leaves with venation more or less brochidodromous. Inflorescences spicate; bract and bracteoles large, usually broad, thicktextured, persistent. Flowers sessile (rarely subsessile); perianth 5–6(–8)-merous. Sepals obovate to oblanceolate (to nearly ligulate), oblanceolate-oblong or narrowly elliptic (in H. louvelianum H. Perrier oblong-ovate to ovate-deltoid), spreading, accrescent (only slightly so in H. louvelianum ); calyx tube short, broadly funnelform to cup-shaped, or in fruit hemispherical. Petals ovate to oblong, usually smaller than sepals, modestly accrescent and curving over fruit (in H. louvelianum similar to sepals in size and spreading); sepals and petals not ciliate, or ciliolate in conjunction with overall surface pubescence. Sepal glands large, elliptic to elongated oblong-elliptic or roughly trapezoidal. Stamens 1 per petal, inserted between glands; anthers dorsifixed, broadly oblongelliptic with oblong-elliptic locules and a large connective, the slits of dehiscence nearly parallel. Upper surface of ovary often nearly flat in flower, in fruit becoming hemispherical or broadly conical; styles 3–4, fused basally (rarely fused for most of length). Locule of fruit subglobose or vertically compressed, internally glabrous (short-pubescent); seeds sometimes 1 per fruit, subglobose, largely filling the locule (or several small immature seeds, possibly most never maturing).

Key to the species of Homalium sect. Nisa

1. Sepals about equal to petals at anthesis, broadly oblongovate (to ovate-deltoid), in fruit slightly accrescent, <3.5 mm and only modestly longer than petals; petals not curving inward over fruit ............. 5. H. louvelianum View in CoL

1a. Sepals longer than petals at anthesis, oblanceolate to narrowly oblong-oblanceolate, spatulate, narrowly elliptic, or nearly ligulate (in flower obovate to elliptic), in fruit conspicuously accrescent,> 3.5 mm and much longer than petals; petals usually curving inward as fruit matures .... 2

2. Sepal glands densely pubescent on upper (inward-facing) surface ............................................... 10. H. stelliferum View in CoL

2a. Sepal glands glabrous or glabrate throughout .............. 3

3. Leaves lanceolate; stipules free ............ 4. H. intercedens View in CoL

3a. Leaves elliptic, oblong-elliptic, obovate or oblanceolate (rarely to ovate, very rarely a few lanceolate); stipules fused, opposite petioles ................................................ 4

4. Calyx densely pubescent to sericeous at least on cup, basal portion of abaxial sepal surface .................................... 5

4a. Calyx glabrous or sparsely pubescent, often more densely short-pubescent on cup, with trichomes confined to medial or marginal areas of one or both sepal surfaces ............. 7

5. Leaves elliptic to narrowly elliptic, obovate, or oblanceolate, (2.5–)3–6(–9) × 1.3–2.5(–3) cm, without marginal glands; bracts and bracteoles often ciliate, pubescent only along midrib or glabrous; adaxial surface of sepals glabrous; petals 1.5–2.5 mm, densely pubescent abaxially (to sparsely at margins), densely to sparsely pubescent adaxially; filaments 0.9–1.1 mm, anthers 0.2–0.3 mm ............ .................................................................... 11. H. tenue View in CoL

5a. Leaves elliptic to broadly or narrowly elliptic or obovate, (3.3–)5–9.5 × (1.8–)2–4.5(–5.4) cm, usually with inconspicuous marginal glands; bracts and bracteoles ciliate and usually pubescent throughout (mostly along midrib); adaxial surface of sepals short-pubescent at least basally; petals 2–5 mm, velutinous on both surfaces; filaments (1.2–) 1.9–2.8 mm, anthers 0.4–0.65 mm ..................... 6

6. Flowers mostly borne in pairs or closely clustered; bracts and bracteoles 3.5–5 mm; calyx cup long-sericeous, both sepal surfaces densely pubescent; southern Madagascar............................................................. 2. H. ciliolatum View in CoL

6a. Flowers usually borne singly; bracts and bracteoles 1.5– 2.5(– 3) mm; calyx cup densely pubescent, sepals densely pubescent towards base of both surfaces, becoming sparsely pubescent (to glabrous) near apical margins; northeastern Madagascar............... 1. H. antilahimenae View in CoL

7. Petioles (10–) 15–30 mm; inflorescences paniculate, pubescent; flowers mostly paired ...................... 9. H. retusum View in CoL

7a. Petioles 3–15 mm; inflorescences racemose or paniculate, glabrous or seldom sparsely or patchily pubescent; flowers borne singly ................................................................. 8

8. Leaves oblanceolate, (2.7–)3.4 – 6.8 × (0.9 –) 1.1 –2 cm, with revolute margins; inflorescences racemose, (0.5–)1–2.5(–3.3) cm; filaments 0.5–0.8 mm, anthers ca. 0.2 mm .............................................. 6. H. mandenense View in CoL

8a. Leaves elliptic to broadly or narrowly elliptic, oblong-elliptic, or obovate (to oblanceolate in H. nudiflorum View in CoL ), 4.9–16 × 1.5–9 cm, with entire (sometimes partly, not strongly revolute), crenate, or serrate to dentate margins; inflorescences racemose or paniculate, (2–) 3– 12 cm; filaments 1.6–3.1(–3.7) mm, anthers (0.3–)0.5–0.7(–0.8) mm ..... 9

9. Leaves (5 –)6 – 16 × (1.8 –)3 – 6.2(– 7) cm with petiole 3–7(–10) mm; leaf margins usually prominently toothed

(subentire) with elongated glands in tooth apices; both surfaces of petals densely (to moderately) pubescent especially on apical half; humid forests to drier central forests, at elevations of 445–1860 m ................. 3. H. confertum View in CoL

9a. Leaves 4.9– 14.5 × 1.5–7 cm with petiole (3–)4–13(–15) mm; leaf margins entire to repand (crenulate, partly somewhat revolute), with glands small and round or absent; petals usually moderately (to densely) pubescent only at apex of one or both surfaces (rarely on entire apical portion), otherwise sparsely pubescent with often ciliate margins, or glabrous; humid (to littoral) forests, at elevations of 12–1220 m ............................................ 10

10. Leafing internodes (1.7 –)2– 4(–5,5) mm diam.; leaves 8.5– 14.5 × 5 –7 cm; inflorescences paniculate; petals in fruit 3–5.6 mm ................................. 8. H. pachycladum View in CoL

10a. Leafing internodes (0.9–)1.1–2.4(–3.2) mm diam.; leaves 4.9–9(–10.5) × 1.5–4.2(–5.4) cm; inflorescences racemose (paniculate); petals 1.5–4 mm .............. 7. H. nudiflorum View in CoL

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Malpighiales

Family

Salicaceae

Loc

Homalium sect. Nisa (Noronha ex Thouars) Baill. ex Warb.

Wassel, Anna C. & Applequist, Wendy L. 2020
2020
Loc

Engl. & Prantl 1893: 36
1893
Loc

Nisa

Noronha ex Thouars 1893: 36
Noronha ex Thouars 1886: 575
1893
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