254 ON SOUTH-AMERICAN APOCYNACEZ. 
ments small, ovate, erect ; stamens included, seated on a pilose ring above the base of 
the tube; disk of 5 lobes, surrounding the ovaries. 
This species is placed by Messrs. Bentham and Hooker (Gen. ii. p. 725) in Odontadenia, 
to which genus it is seen to bear no relation whatever. 
16. LASEGUEA LEPTOCARPA, nob.: Parsonsia leptocarpa, Hook. Arn. Journ. Bot. i. p. 287. In Brasilia, 
prov. Rio Grande do Sul. 
A species near the preceding, climbing to the top of the highest trees. It has pubescent 
branches, with glabrous, oval, obtuse, membranaceous leaves on short petioles ; raceme 
terminal, subsessile, covered closely with imbricating, small, acutely oval bracts; tube 
of corolla nearly twice the length of the sepals, pilose within towards the base ; its seg- 
ments lanceolate, rotate; lobes of the disk acute; follicles 1-2 feet long, less than a line 
thick. These are all the particulars recorded, from which it is evident that it is a species 
closely allied to the preceding. : 
17. Lasecura Jsornt, nob.: Urechites Jegeri, Müll. in Linn. xxx. p. 443. In Hayti: non vidi. 
There is no indication whatever that this plant belongs to Urechites ; on the contrary, 
it differs in its habit and inflorescence, in which respects it agrees well with Laseguea. 
Miller saw only an immature flower, and, what is more important, knew nothing of its 
fruit and seeds. Its branches are subscandent, cinereously purpurescent, glabrous, the 
branchlets slender, paler, terete, patently hirsute; leaves oblong-elliptic or broadly 
oblong, subcordate at the base, suddenly and shortly acuminate, membranaceous, pilose 
on both sides, paler beneath, with reticulate veins, 12-31 in. long, 13-2 in. broad, on _ 
petioles (short, as stated in the final note) 121-2 lines long (31-5 mm., not em.); racemes 
lateral, longer than the leaves, hirsute, with long white hairs; peduncle many times 
longer than the petiole, laxly many-flowered ; pedicels twice as long as the sepals, sup- 
ported by linear-acute bracts 52-84 lines long, 1-12 line broad; sepals linear, acuminate, 
7-83 lines long; corolla immature, narrowed at its base for one fourth of its length, 
broader above, niveo-hirsute outside, with short segments; disk distinctly 5-lobulate, a 
little shorter than the ovaries. These characters strictly conform with Laseguea, not 
with Urechites. 
The Laseguea calycosa, Griesb., = Rhodocalya calycosus (supra, p. 140). 
H&MADICTYON. 
It has already been stated (p. 148) that the authors of the ‘Genera Plantarum’ have 
merged this genus in Prestonia, merely on account of the presence, in both cases, of 
certain faucial appendages in the corolla; and some of the reasons were then given (/oc- 
cit.) for rejecting this union; others, equally potent, are here offered. The plants of 
Hemadictyon may generally be recognized by their habit: their leaves are very often 
more diaphanous, of a peculiar hue, exhibiting beautifully coloured veins (whence the 
generic name); the dilated axils of the branches are quite bare of the many stipules pre- 
sent in Prestonia ; the inflorescence, upon a long simple flexuose peduncle always bare 
