94 NATURAL HISTORY OF PLANTS. 
X. URENA SERIES. 
Urena' (fig. 150) has flowers constructed nearly like those of the 
Mallows ; they have the same corolla, androceum, seed and embryo. 
Their calyx is gamosepalous and valvate. The tube of the androceum 
is truncate or quinquedentate® at its apex. The 
gynæceum is composed of five carpels super- 
posed to the petals.* The ovaries free among 
themselves are only attached to 
the columella by their inner 
edge. Hach of them encloses 
an ovule inserted towards the 
base of its inner angle, ascend- 
ing, with exterior‘ micropyle. 
But these five carpels are sur- 
mounted by a style with ten 
branches, of which five are 
superposed to the ovaries, and five alternate. At maturity the 
monospermous, glochidiate, indehiscent carpels separate from the 
Four or five Urenas are known growing in tropical Asia 
They are herbs or sbrubs with alternate stipulate leaves 
generally angular or lobed. ‘The flowers are sessile or pedunculate, 
axillary or arranged in terminal spikes. They are enveloped by a 
quinquefid involucre, with lobes alternating with those of the calyx. 
This series may be divided into three subseries : ÆZuwreneæ (Urena), 
where the ovary cells are oppositipetalous ; Pavoniee (Pavonia [fig. 
151], Afalachra, Gethea), where they are generally alternate, and 
Urena lobata. 
Pavonia hastata. 

Fie. 150. 
Diagram. 
Fig. 151, 
Fruit. 
columella. 
and Africa. 

It was formerly believed 
reduced to a style. 
pair of 
that each ovary corresponded to a 
styles. 
6 Cav., Diss., vi. t. 183-185.—Corz., Hort. 
Ripul., t. 26.—SoHRANk, Hort. Monac., t. 79.— 
H. B. K., Nov. Gen. et Spec., v. 277.—A. S.H., 
Pl. Us. Bras., t.56; Fl. Bras. Mer., i. 219.— 
1 L., Gen. n. 844.—Anpans., Fam. des Pl, 
ii. 400.—J., Gen., 272.—GÆRTN., Fruct., i. 
252, t. 185.—Porr., Dict., viii. 252; Suppl. 
v. 404.—Lamx., JU, t. 583.—DC., Prodr., i. 
441,—ENDL., Gen., n. 5274,—PaveER, Organog., 
89, t. 7.—B. H., Gen., 205, n. 25.—H. BN., in 
Payer Fam. Nat., 282. 
? The teeth are oppositipetalous. 
3 A, Dickson, in Adansonia, iv. 208, t. 6, 
fig. 7. 
4 Tt has a double coat. 
5 Which is, as demonstrated by PAYER, that 
of the ten pre-existing carpels, five only having 
developed their ovary, the five others remain 
Watut., Pl. As. Rar., t. 26.—GRISEB., FU. Brit. 
W.-Ind., 81.—Tr. et PL., in Ann. Sc. Nat., 
sér, 4, xvii. 158.—Srrm., Fl. Vit., 16.—Masr., 
in Oliv, Fl. Trop. Afr., i. 189.—Bot. Mug. 
t. 3049—Watp., Rep., i. 297; v. 89; Ann. 
ii. 140; iv. 302; vii. 399. 
