Classification of Boraginaceae subfam. Ehretioideae: Resurrection of the genus Hilsenbergia Tausch ex Meisn.
Miller, James S.
Adansonia
2003
3
25
2
151
189
6LX4S
J.S. Mill.
J. S. Mill.
2003
[743,1085,1030,1056]
Magnoliopsida
Ehretiaceae
Hilsenbergia
GBIF
Plantae
Boraginales
23
174
Tracheophyta
species
leslieae
sp. nov.
Frutex vel arbor parva usquead 5(-10) m alta, ramunculis glabris. Folia ad apice ramunculorum brachyblastorumve in fasciculos densos disposita; lamina obovata usqueoblanceolata, 10-21(-30) mm longa, 6- 12(-16) mm lata, apice obtusa usquerotendata vel emarginata, basi cuneata, margine integra, leviter incrassata, utrinque glabra; petiolo 2-5(-7) mm longo. Inflorescentiae terminale, cymosae. Floresbisexuales; calyce campanulato usquetubulari-campanulato, 4-4.5 mmlongo, 5-lobo, extus glabro, intus apiceum versus dense pubescente; corolla alba, urceolata, 5-6 mmlonga. Fructus drupaceus, ovoideus usquelate-ovoideus, 4- 5.5 mmlongus, 3-4 mmin diam.; pyrenis 4, porcati. TYPUS. — Miller& Miller3787, Madagascar, Prov. Toliara, 14 kmSE of Tuléaron the road to Sakaraha, 100 m, 23°21’S, 43°42’E, fl., 26 Dec. 1988(holo-, MO!; iso-, K!, MO!, P!). Shrub or small tree to 5(-10) m tall, thickstemmed, densely branched, the twigs glabrous, often glaucous and densely waxy with age. Leaves fasciculate at branch tips or on short lateral spur shoots, deciduous; blades obovate to oblanceolate, 10-21(-30) mm long, 6-12(-16) mm wide, (length:width ratio 3:1-3:2), the apex obtuse to rounded or emarginate, the base cuneate, the margin entire, slightly thickened, both surfaces glabrous, rarely minutely ciliate along the margin near the leaf base, the venation obscurely brochidodromous, the midrib even with the leaf surface, raised slightly below, the secondary veins 3-4, often indistinct, the tertiary venation reticulate; petioles 2-5(-7) mm long, less than half the length of the blade, or nearly sessile on young leaves, glabrous or rarely minutely puberulent, prominently canaliculate on the adaxial surface. Fig. 10. — Hilsenbergia labatiiJ.S. Mill.: A, fruiting branch; B, whole flower; C, open flower showing androecium and gynoecium; D, young fruit with persistent calyx; E, dorsal view of pyrene; F, cross-section of dorsal surface of pyrene. A, D, E, F, Labat 2282; B, C, Humbert18924. Drawn by A. JOUY. Inflorescences terminal, reduced cymes of 1- 3(-4) flowers, the branches glabrous. Flowers bisexual, on pedicel-like inflorescence branches 2-6 mmlong; calyx campanulate to tubular-campanulate, 4-4.5 mmlong, 3-4 mmwide, 5-lobed, the lobes valvate, triangular, 1-1.5 mmlong, densely pubescent on the apical part of the interior surface, the outer surface glabrous; corolla white, urceolate, 5-6 mmlong, 3-4 mmwide, 5-lobed, the lobes erect to spreading, ovate, 1- 2 mmlong; stamens 5, the filaments 3-4 mmlong, the upper 1-2 mmfree, glabrous, the anthers ellipsoid, 1-1.5 mmlong; ovary conical, 1.2-1.5 mmlong, 0.8-1 mmwide, the style 1.5- 2 mmlong, the 2 stigmas capitate and terminal. Fruits drupaceous, color at maturity unknown, borne in the persistent cup-shaped to spreading calyx, ovoid to broadly ovoid, 4- 5.5 mmlong, 3-4 mmin diameter, the endocarp bony, separating into 4 pyrenes at maturity, c. 4 mmlong, c. 2.5 mmwide, ridged on the exterior surface. — Fig 12. Hilsenbergia leslieaeis variable in habit, usually being an erect shrub or small tree, sometimes reaching 10 min height (e.g. Humbert28919), but occasionally is low and prostrate (e.g. SF28553, from wind-swept areas near Cap Sainte-Marie). This species appears to be closely related to, and is easily confused with, H. croatiiand the differences between them are discussed under that species. Fig. 11. — Distributions of Hilsenbergiaspecies, mapped on the simplified bioclimate zones of Madagascar (after CORNET 1974; see SCHATZ 2000). Hilsenbergia leslieaeis named in honor of my wife, Leslie MILLER, who accompanied me during field studies for this project, including the collection of the typespecimen.
DISTRIBUTION. — Hilsenbergia leslieaeoccurs in southern Madagascar( Fig. 11) on calcareous substrates. VERNACULAR NAMES. — Taikoaky, Tsingena.
CONSERVATION STATUS. — Provisional IUCN Red List Category: Endangered (EN B2ab(i-iv)). Hilsenbergia leslieaeoccurs at scattered localities in southern Madagascar, but it is infrequently collected and its Extent of Occurrence is only 60 km 2. It is known to occur in the Réserve Naturelle Intégrale de Tsimanampetsotsa. PARATYPES. — MADAGASCAR: Chauvet190, Prov. Toliara, route Sarodrano, Tuléar, fl., fr., 23°28’S, 43°46’E, 13 Nov. 1961( P!, TEF!); Humbert5403, Prov. Toliara, du lac Tsimanampetsotsa, au delta de la Linta, près d’Itampolo, 1-10 m, 25°02’S, 44°04’E, fl., 17-24 Aug. 1928( P!); Humbert28919, Prov. Toliara, environs d’Antanimora, 20-25 kmau SSE, bush xérophile sur terrains cristallins, 200-500 m, 24°49’S, 45°40’E, fl., 6-9 Feb. 1955( P!); Perrier de la Bâthie4434, Prov. Toliara, dunes au nord de Tsimanampetsotsa, 24°03’S, 43°43’E, fl., fr., June 1910( P!); Phillipson3042, Prov. Toliara, SE of Tuléar on Route Nationale7, 15 km from town, near La Table, 75 m, 23°25’S, 43°47’E, fl., 28 Dec. 1988( P!); Phillipson, Labat& Du Puy3450, Prov. Toliara, 38 kmSW of Ampanihy, on road to Androka, calcareous plateau, 200 m, 24°50’S, 44°25’E, fr., 5 Feb. 1990( P!); Service Forestier: SF11723(Capuron), Prov. Toliara, sur les pentes du massif de l’Angavo, à l’est d’Antanimora, 200-530 m, 24°49’S, 45°40’E, fl., 24-25 Jan. 1955( P!); Service Forestier: SF25252, Prov. Toliara, Tsimandaha, Antanimora, Dist. Ambovombe, 330 m, 24°49’S, 45°40’E, ster., 28 Oct. 1964( P!); Service Forestier: SF 25255, Prov. Toliara, Tsimandaha, Antanimora, Dist. Ambovombe, 330 m, 24°49’S, 45°40’E, ster., 28 Oct. 1964( MO!, P!); Service Forestier: SF28553(Capuron), Prov. Toliara, Cap Sainte-Marieet environs Nord du Cap, 25°34’S, 45°09’E, fl., 17 Dec. 1968( P!).
1988-12-26
MO, K, P
Miller
Madagascar
100
-23.35
Tulear
1256
43.7
23
174
1
Toliara
1961-11-13
P, TEF
Madagascar
Chauvet
-23.466667
Sarodrano
1255
43.766666
Prov.
26
177
1
Toliara
paratype
1928-08-17
1928-08-24
1928-08-17
P
Prov. & Tsimanampetsotsa & de la Linta & d'Itampolo
Madagascar
6
-25.033333
Toliara
1248
44.066666
26
177
1
Toliara
paratype
1955-02-06
1955-02-09
1955-02-06
P
Prov. & d'Antanimora
Madagascar
350
-24.816668
Toliara
1249
45.666668
26
177
1
Toliara
paratype
1910-06
P
Perrier de la Bathie & de Tsimanampetsotsa
Madagascar
-24.05
Toliara
1253
43.716667
26
177
1
Toliara
paratype
1988-12-28
P
Phillipson & Prov. & La Table
Madagascar
75
-23.416666
SE of Tulear on Route Nationale
1256
43.783333
26
177
1
Toliara
paratype
1990-02-05
P
Phillipson & Labat & Du Puy & Prov. & Androka
Madagascar
200
-24.833334
38 km SW of Ampanihy
1249
44.416668
26
177
1
Toliara
paratype
1955-01-24
1955-01-25
1955-01-24
P
Service Forestier & de l'Angavo
Madagascar
365
-24.816668
d'Antanimora
1249
45.666668
Prov.
26
177
SF11723
1
Toliara
paratype
1964-10-28
P
Service Forestier
Madagascar
Prov.
330
-24.816668
Antanimora
1249
45.666668
Tsimandaha
26
177
SF25252
1
Toliara
paratype
1964-10-28
MO, P
Service Forestier
Madagascar
Prov.
330
-24.816668
Antanimora
1249
45.666668
Tsimandaha
26
177
SF 25255
1
Toliara
paratype
1968-12-17
P
Service Forestier & Nord du Cap
Madagascar
-25.566668
Cap Sainte-Marie
1245
45.15
Prov.
26
177
SF28553
1
Toliara
paratype