The genus Hilliardiella (Asteraceae: Vernonieae) in southern Africa *
Author
Swelankomo, N.
Author
Manning, J. C.
Author
Magee, A. R.
text
South African Journal of Botany
2016
2016-09-30
106
41
59
http://dx.doi.org/10.1016/j.sajb.2016.05.010
journal article
10.1016/j.sajb.2016.05.010
1727-9321
10496343
2.
Hilliardiella flanaganii
(E.P.Phillips) H. Rob. et al.
in PhytoKeys 60: 87 (2016).
Vernonia hirsuta
var.
fl
anaganii
E.P. Phillips
in Ann. S. Afr. Mus. 16: 116 (1917); Hilliard, Comp. Natal: 45 (1977).
Vernonia
flanaganii
(E.P. Phillips)
Hilliard in Notes R.B.G. Edinb. 42: 238 (1985).
Type
: Free State-Natal Border, Elands River Valley near Mont Aux Sources,
1890 m
,
Flanagan 1947
(SAM, lecto.!, designated by Hilliard: 238 (1985); PRE!, isolecto.)
Herbaceous perennial,
0.6–1.2 m
tall, with erect annual stems from a woody rootstock; stem simple, leafy throughout, striate, gland-dotted and densely tomentose with soft, shaggy whitish or yellowish hairs; eglandular vestiture of stalked medifixed T-shaped hairs.
Leaves
subsessile or shortly petiolate, oblong-elliptic to obovate, 30–120 ×
10–55 mm
, acute or acuminate, base cuneate, margins sub-entire or serrate-crenate, drying discolorous, upper surface gland-dotted and sparsely pilose, lower surface closely gland-dotted and densely woolly-tomentose with prominent venation beneath, vestiture of short-stalked medifixed T-shaped hairs mixed with long-stalked hairs; petiole
5 mm
long.
Capitula
corymbose, sometimes congested and sub-capitate, ± 15- flowered.
Involucre
campanulate,
9–10 mm
diam.when pressed; bracts ± 4-seriate, gland-dotted and sparsely sericeous-tomentose, eglandular vestiture of medifixed T-shaped or Y-shaped hairs, outer two series subulate, 2–4 ×
0.5 mm
, inner two series lanceolate-pungent, gradually narrowed and long-apiculate, with purple apices, 5–7 × 1.0–
1.5 mm
.
Florets
purple, corolla
5–7 mm
long, gland-dotted and with scattered, appressed hairs distally and on lobes, vestiture of subsessile medifixed Tshaped hairs, lobes 1.5–2.0 mm long.
Anthers
sagittate with ovate apical appendages.
Style
3.5 mm
long, branches 1.5–2.0 mm long.
Cypselas
sub-cylindric, 4- or 5-ribbed, 2.0–
2.5 mm
long, densely sericious and gland-dotted; pappus bi-seriate, outer scales
1–2 mm
long, inner bristles
4–5 mm
long, white.
Flowering time
: October to January. (
Figs. 1G
,
2B
,
3B
and
7
).
Fig. 4.
Eglandular stem trichome morphology in southern African species of
Hilliardiella
. A.
H. hirsuta
(
Compton 24599
, NBG), short-stalked medifixed Y-shaped trichome with arms longer than stalk; B.
H. sutherlandii
(
Compton 31076
, NBG), long-stalked asymmetrically Y-shaped trichome with arms shorter than stalk; C.
H. aristata
(
Barker 7971
, NBG), short-stalked medifixed T-shaped trichome with arms almost appressed to surface. Scale bar = 250 μm (0.25 mm).
Distribution and habitat
: endemic to the Drakensberg in
KwaZulu-Natal
and adjacent eastern
Free State
, from Harrismith to Sani Pass (
Fig. 8
), occurring on damp grassy slopes and below cliffs, from
1350–2135 m
.
Diagnosis
:
Hilliardiella
fl
anaganii
resembles
Hilliardiella hirsuta
in its relatively broad, oblong-elliptic to broadly obovate leaves with the upper surface sparsely pilose and the lower surface densely woolly-tomentose and prominently veined but is distinguished by the cuneate base narrowed into a short petiole
5 mm
long (
Fig. 1G
), and the larger capitula with longer, lanceolate inner involucral bracts,
5–7 mm
long gradually narrowed to a long-acuminate or pungent apex (
Fig. 2B
). The species favours moister places than does
H. hirsuta
and the two are often sympatric in the
KwaZulu-Natal
Drakensberg (
Hilliard, 1977
;
Hilliard and Burtt, 1985
).
Additional specimens seen.
South Africa
.
FREE STATE
.
2828 (Bethlehem)
: Golden Gate National Park, Mt. Pierre Kloof (–DA),
12 Dec 1988
,
Gertenbach & Groenewald 8939
(PRE); Witzieshoek, mountain slope in sunny places (–DB), 1984,
Paton 48
(PRE); Mont Aux Sources (–DD),
1 Oct 1950
,
Sidey 2029
(PRE).
Without precise locality
:
Orange Free State
,
Oct 1894
,
A
. Bolus sub-Guthrie 4820
(NBG).
KWAZULU-NATAL
.
2829 (Harrismith)
: Drakensberg Botanical Garden (–AC),
26 Nov 1979
,
Jacobsz 2234
(PRE); Cathedral Peak (–CC),
12 Dec 1950
,
Munro 11
(PRE); Cathedral Peak Forest Station, Mike's Pass (–CC),
23 Dec 1988
,
Luck
RSA
64.88
(PRE).
2929
(
Underberg
): Cathedral Peak Forest, 160 yards [
145 m
] north-east of weir site among boulders at base of krantz (–AB),
19 Oct 1950
,
Killick 1048
(PRE); Monk's Cowl Forest (–AD),
19 Dec 1988
,
Luck
RSA
65.88
(PRE); Giant's Castle (–AD),
Oct 1914
,
Symons 43
(PRE); Tabamhlope (–BA),
15 Nov 1937
,
Pentz 373
(PRE);
1 Dec 1964
,
Miller 351
(PRE); Estcourt, Little Berg, top of mountain (–BB),
26 Dec 1936
,
West 27
(PRE); Kamberg, Game Pass Farm (–BC),
10 Jan 1990
,
Williams 693
(PRE); near Sani Pass Hotel (– CB),
15 Dec 1988
,
Luck
RSA
66.88
(PRE); Sani Pass, hills of police post, below cliffs (–CB),
16 Dec 1984
,
Hilliard & Burtt 18009
(PRE).