A New Brazilian Species of Dalechampia subsect. Triphyllae (Euphorbiaceae)

4 Pages·1991·2.7 MB·English

by  Grady L Webster

NEW
A
BRAZILIAN
SPECIES
DALECHAMPIA
OF
SUBSECT.
TRIPHYLLAE
(EUPHORBIACEAE)
Dalechampia new
allemii described as a spe- distinctly unguiculate (claw about Vi length of bract),
is
Dalechampia
cies in sect. subsect. Triphyllae, deeply 3-lobed; lobes entire, with stimulose and
new
This species from Bahia, Brazil, isolated simple hairs proximally; middle lobe elliptic-lan-
is
within subsect. Triphyllae because of unguic- ceolate, 0.6-1 x 0.15-2 cm; lateral lobes some-
its
what 0.5-0.7 X 0.2-0.3 cm;
ulate involucral bracts, suppressed adstaminate pis- falcate, bracteal
and 1.8-2.2 x
tillate bractlets, sparsely lobed pistillate sepals. stipules lanceolate, slightly unequal,
A mm.
key provided to the Brazilian species of subsect. 0.9-1.2 Pistillate cymule: abstaminate bract
is
mm;
Triphyllae. ovate, eglandular, 1.2-2.2 x 2 adstaminate
bractlets suppressed. Pistillate flowers subsessile or
mm
1978
During a field trip to Brazil in with Antonio with pedicels up to 1.5 at anthesis; sepals
EMBRAPA/CENARGEN,
AUem
of Brasilia, I en- generally 6, usually with or 2 lateral lobes below
1
Dalechampia
countered an interesting species of the middle, sometimes with minute intercalary
se-
in the scrubby vegetation in the interior of the state paloid projections; lobes minutely apiculate but not
of Bahia. This plant clearly has not been described, glandular-capitate; ovary minutely hispidulous; sty-
and indeed does not appear to have any very close lar column cylindrical, glabrous or sparsely hispidu-
mm,
x
relatives. lous below, ca. 5 0.5 with stigmatic bands
%
extending the length; stylar apex excavated,
Dalechampia allemii Webster, sp. nov., sect. eccentric, 0.4-0.6 x 0.6-0.8 mm. Staminate cy-
Dalechampia
subsect, Triphyllae. TYPE: Bra- mule with densely hispidulous peduncle up to ca.
mm
Mun.
Bahia: Andarai, scrub at edge of 2 long; involucel 2-lipped, rather deeply 4-lobed
zil.
W
km N
forest, 50 of Andarai, 5 Nov. 984, (but middle adpistillate lobe reduced or suppressed);
1 1
&
AUem, Webster W. Werneck 2.5-5 x 3.5-7 mm,
A. C. G. L. L. lobes ovate,
lateral adpistillate
DA
2980 CEN;
(holotype, isotype, V). Fig- margins entire or sometimes remotely and minutely
ure
1. glandular; adpistillate central lobe elliptic, small
mm
(11. 1.5-
5 long) or obsolete; abpistillate lobe
Habitu clausseniana et D. olfersiana similis, sed
Z).
mm,
X
enclosing the resiniferous gland;
2.5 3
bracteis involucratis unguiculatis, involucello sub-
differt
mm,
X
gland ca. 2 3.5 of or 2 rows of entire
trifido, sepalis 9 lobis paucis. 1
laminar ceriferous bractlets; resinous secretion pale.
Twining vine; flowering stems terete, puberulent
whitish. Staminate flowers subsessCe; mature buds
0.1-0.2 mm
near with retrorsely recurved hairs
tips
angled, 2.3-2.8 across, glabrous or nearly so;
mm mm
long and sparse, spreading hairs 0.3-0.5
.8-
^.^i^^ splitting into 3 or 4 recurving segments 1
long. Leaves: stipules reflexed, deciduous, lanceo- mm;
2.5 X 1.3-1.8 staminal column very short
mm
3-
0.3-0.6 mm
mostly
strigose (hairs long),
late, 50-80;
stamens
^q.S or glabrous;
less), fila-
3.5 X 0.7-1 mm; petiole puberulent as the stems, mm
^^^^^ glabrous, 0.2-0.3 long; anthers ca. 0.4
2.5-5 cm ^^ mm
long; stipels at base of blade lanceolate, 8-10
Middle fruiting pedicel long,
j^^^g
mm
mm
0.8-1.7 lamina chartaceous, 3-foholate,
long;
2.5-4
i^^^^^j fruiting pedicels long; fruiting
on and margins; middle
sparsely hirtellous veins 3_4 mm,
^^p^jg ^ 0.4 0.8 flattened, mostly with
mm
leaflet elliptic -lanceolate, apiculate or shortly acu- 0.2-0.5
^ p^jj. ^^ medial lateral lobes ca. long;
mm
minate at the pinnately veined (major laterals
tip, columella ca. 4 long; capsule valves ca. 5.5
on 4.5-6.5 x cm; mm
5 or a side), 1.7 4 lateral
long, inconspicuously strigose-hispidulous; seeds
asymmetrically apiculate, with 2
leaflets elliptic,
not seen.
3-4
from x .5-2.2 cm; some-
veins base, veinlels
1
Additional specimens examined. Brazil, bahia:
what prominulous beneath; margins
entire. Inflo-
Km
BR
Mar. 1978,
^un. Andarai. 39, Andarai, 242, 4
3-0 ccmm
rreesscceenncceess oonn aaxxUUllaarrvy sshnoooottss u.6 v.i7
ssoolliittaarrvy
^
^.^.^^ iS02 (CEN, DAV).
^^^^^
^^^^^
long, with a single reduced or obsolete leaf (blade
< cm Dalechampia allemii appears outstanding
0.5 long) at the single node; peduncle be-
Dalechampia
cm among known species of sect.
coming 1.8 2.5 long; involucral bracts pale all
&
(Webster Armbruster, 1990)
1-1.3 x 0.7-1 cm,
green subsect. Tri/j/ij/Zae
yellowish anthesis,
at
258. 1991.
Missouri
256 Annals of the
Garden
Missouri Botanical
I
—
— —
Figure 1. Dalechampia allemii. A. Flowering branch. B. Stipule. C. Inflorescence at anthesis. D. Pis
—
—
tillate cymule.— E. Abstaminate pistillate bract. F. Pistillate flower (calyx removed). G. Fruiting sepal. H. Sta
—
minate subinflorescence. Resiniferous bractlet. Staminate flower.
I. J.
Volume Number
78, Notes 257
1
1991
in its small unguiculate involucral bracts, sup- in 1978 and has published the first critical reas-
pressed adstaminate
pistillate bractlets, staminal sessment of the taxa of subsect. Triphyllae since
& &
involucel with only 3 well -developed segments, and the treatment of Pax Hoffmann (AUem Wae-
pistillate sepals with usually a single pair of lateral chter, 1977).
The
among
lobes. small size of the involucral bracts Relationships the species of Dalecham-
is
&
reminiscent of D. micromeria Baillon of southern pd\ia subsect. Triphyllae as defined by Webster
Brazil, but in that species the bracts are differently Armbruster (1990) require further study; such spe-
shaped, the stamens fewer (10-25), and styles cies as clausseniana, D.
Z>.
ifc
&
shorter (2-4 mm). In the treatment by Pax ^e^eromor/^^a are highly and
variable, species lim-
Hoffmann down
(1919), D, allemii would key near are uncertain
its
D, olfersiana Muell. Arg.; however, that species species of subsect. Tr/^/ij/^ae should aid locating
in
more heavily pubescent and has nonunguiculate
is Z). allemii as far as gross morphological characters
and Somewhat more
bracts clavate styles. similar are concerned. Morphological terminology
follows
in appearance to D, allemii D. clausseniana the treatment Webster
is of
which
Baillon, also has nonglandular
pistillate se-
&
Dalechampia
pals; however, that species differs in larger non- subsect. Triphyllae (Pax
its
&
unguiculate involucral bracts, well-developed ad- Hoffm.) Webster Armbruster,
Bot. Linn.
J,
staminate staminate Dalechampia
pistillate bractlets, involucel Soc. (in press). sect. Triphyllae
&
4-7
with 2 entire lips, and pistillate sepals with Pax Hoffm., Das Pflanzenreich IV. 147.
pairs of lateral lobes. XII(Heft 68): 13. 1919. type: Dalechampia
It is a great pleasure to dedicate this distinct triphylla Lam.
new Dalechampia
species of to Antonio Allem, of
Twining indumentum
vines, often sparse; leaves
EMBRAPA/CENARGEN
AUem
BrasQia. Dr.
in
3-foliolate (rarely 5-foliolate), sometimes also with
made
has substantial contributions the system-
to
simple leaves; floriferous shoots axillary; bracts
Euphorbiaceae and
atics of Brazilian the leading
is
greenish, unlobed or 3-lobed; staminate involucel
authority on the taxonomy of the genus Manihot.
7-11
with stamens 10-100;
flowers;
pistillate se-
The
dedication also especially appropriate be-
is
6-12,
pals entire to deeply pinnatifid; seeds smooth.
cause Dr. Allem was the collector of the species
first
Key
Tentative to the Brazh.ian Species of Subsect. Triphyllae
mm
Leaves 2.8-3.5
la. 3-foliolate; seeds long.
mm)
much
2a. Pistillate sepals oblong or obovate, with broad rachis (3-3.5 in fruit, rachis broader than
lateral teeth (mostly 0.5-1 mm); foliage and involucral bracts nearly glabrous D. triphylla Lam.
mm)
2b. Pistillate sepals linear-lanceolate, with narrow rachis (not broader than 1.5 in fruit, lateral teeth
mostly broader than
rachis.
3a. Pistillate bractlets not glandular-capitate on margins.
4a. Pistillate sepals without glandular-capitate lobes.
5a. Involucral bracts unguiculate; adstaminate pistillate bractlets suppressed; pistillate sepals
50-80
mostly with only pair of lateral lobes; staminate involucel 3-Iobed; stamens
1
- D, allemii Webster
5b. Involucral bracts rounded or cordate at base; adstaminate pistillate bractlets developed;
pistillate sepals mostly with 4 or more pairs of lateral lobes; staminate involucel 2-lipped,
scarcely lobed.
mm
3-4
column
6a. Stylar slender, not clavate; ovary strigose; stipules long
D. clausseniana
Baillon
mm
6-8
6b. Stylar column clavate; ovary villose; stipules long D. olfersiana Muell. Arg.
...
4b. Pistillate sepals with glandular-capitate lobes.
mm
12-15 cm
7a. Fruiting sepals long; fruiting peduncle mostly not longer than
1
D, Poeppig
cissifolia
7b. Fruiting sepals shorter; peduncle generally longer.
8. a Involucral bracts usually longer than cm; stamens mostly more than 25 per flower.
1
30-60.
9a. Leaves monomorphic, involucral bracts 3-lobed; stamens
tripartite;
all
mm
3.5-5
10a. Involucral bracts 3-Iobed; fruiting sepals long
D, meridionalis Muell. Arg.
mm
7-8
10b. Involucral bracts unlobed or trifid at tip; fruiting sepals long „
&
bangii Pax K. Hoffm.
Z),
9b. Leaves dimorphic, both tripartite and unlobed; bracts unlobed or 3-lobed; sta-
mm
5-6
mens
less than 30; fruiting sepals long D, burchellii Muell. Arg.
mm
<
cm 2-4
stamens 10-25;
8b. Involucral bracts mostly long, 3-lobed; styles
1
D. micromeria
long, glabrous; leaves tripartite Baillon
all
258 Annals of the
Garden
Missouri Botanical
30
3b. Pistillate bractlets glandular-capitate on margins; stamens or more; leaves pubescent beneath,
D. stenosepala Muell. Arg.
involucral bracts 3-lobed
tripartite;
all
...
mm
Leaves seeds longer than 4 D, regnellii Muell. Arg.
lb. 5-foliolate;
&
Fieldwork Bahia was made possible through Pax, F. K. Hoffmann. 1919. Euphorbiaceae-Dale-
in
champieae. Das Pflanzenreich. IV. 147. XII(Heft
a grant from the National Science Foundation and
1-59.
68):
AUem
the coUaboration of Dr. and personnel of ^£8^/0^1'.
&
W. A
Armbruster. 1990.
syn-
S.
EMBRAPA/CENARGEN,
The
lustra-
Brasflia.
Dalechampia.
opsis of the neotropical species of Bot.
were drawn by Randall.
tions Leslie Linn. Soc. (in press).
J.
—
Grady Webster, Department ofBotany, Uni-
L.
Literature Cited
95616,
Davis^ California
versity of California^
&
Allem, Waechter. 1977. Notas
a. C. L. siste-
J. U.S.A.
maticas nuevos sinonimos en Euphorbiaceae de
y
—
91101.
America Sur Rev. 37:
del Brasil. Biol.
11.