A NO GEISS US 
237 
embryo is delayed until the stimulus of union with the seeond male 
nucleus (cf. Gymnospermae). 
The pollen-tube may enter by the micropyle or by the chalaza 
(p. 81 and cf. Chalazogamae). 
Parthenogenesis, or development of the ovum into an embryo 
without fertilisation, occurs in Antennaria, Alchemilla, &c., embryo 
formation by adventitious budding in Alchornea, Funkia, &c., apo- 
gamy (cf Filicineae) in Balanophora. 
A. are divided into Mono- and Di-cotyledons (q.v. and see 
p. 124). See also Part I. and articles above quoted. 
Angolaea Wedd. Podostemaceae. 1 sp. Angola. 
Angophora Cav. Myrtaceae (11. 2). 4 sp. Austr. 
Angraecum Bory (incl. Maci'oplectrum Pfitz.). Orchidaceae (31). 
About 25 sp. trop. Afr., Madag. &c. Epiphytes ; monopodial. 
The most interesting sp. is A. sesquipedale Thou., the wax-flower. 
At the base of the labellum is an enormous spur, 12 to 14 inches 
long, at the bottom of which the honey is secreted. As Darwin 
observed ( Orchids , p. 162, q.v.), this flr. must have a corresponding 
large insect, with a tongue of the same length, as its fertiliser. This 
idea was ridiculed at the time, but moths with almost as long tongues 
have since been found. The flr. and moth afford an interesting 
example of mutual adaptation (cf Yucca, Ficus, &c.). 
Anguillaria R. Br. Liliaceae (1). 2 sp. Austr., Tasm. 
Anguloa Ruiz et Pav. Orchidaceae (18). 3 sp. Andes; epiphytic. 
Anguria (Tourn.) Linn. Cucurbitaceae (11). 17 sp. trop. Am. 
Anhalonium Lem. = Mammillaria Haw. (same spec, names). A. Wil - 
liamsii Lem.= Echinocactus Williamsii. 
Anigozanthos Labill. Amaryllidaceae (ill). [Haemodoraceae Benth.- 
Hooker.] 10 sp. Austr. Flr. transversely zygomorphic (pp. 31, 73). 
Anisacantha R. Br. (Bassia All. in Nat. Pfl.) Chenopodiaceae (5). 
6 sp. Austr. 
Anisacanthus Nees. Acanthaceae (iv. B.). 5 sp. Mex., Texas. 
Anisadenia Wall. Linaceae. 2 sp. Himal. 
Aniseia Choisy = Ipomoea Linn. 
Anisochilus Wall. Labiatae (vn). 15 sp. trop. As., W. Afr. 
Anisodus Link et Otto. = Scopola Jacq. 
Anisomeles R. Br. Labiatae (vi. 4). 6 sp. Mauritius, Indo-Mal. 
Anisophyllea R. Br. Rhizophoraceae. 5 sp. palaeotrop. It differs 
from other R. in its drupe fruit, exalbuminous seed, and alt. exstip. 
leaves, which are dimorphic in some sp. 
Anisophyllum Haw.= Euphorbia Linn. 
Anisoptera Korth. Dipterocarpaceae. 16 sp. Indo-Mal. 
Anisotoma Fenzl. Asclepiadaceae (11. 4). 2 sp. S. Afr. 
Anoda Cav. Malvaceae (11). About 16 sp. trop. Am. 
Anodendron A. DC. Apocynaceae (11. 4). 7 sp. Ceylon to China. 
Ancectochilus Blume. Orchidaceae (4). 8 sp. Indo-Mal. 
Anogeissus Wall. Combretaceae. 4 sp. trop. Afr. and As. 
